In remote corner of Iraq, an unlikely alliance forms against Islamic State

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In remote corner of Iraq, an unlikely alliance forms against Islamic State
Members of the Sinjar Resistance Units (YBS), a militia affiliated with the Kurdistan Workers' Party (PKK), sit with an Arab tribal fighter (L) in a house in the village of Umm al-Dhiban, northern Iraq, April 30, 2016. They share little more than an enemy and struggle to communicate on the battlefield, but together two relatively obscure groups have opened up a new front against Islamic State militants in a remote corner of Iraq. The unlikely alliance between the Sinjar Resistance Units, an offshoot of a leftist Kurdish organisation, and Abdulkhaleq al-Jarba, a Arab tribal militia is a measure of the extent to which Islamic State has upended the regional order. Across Iraq and Syria, new groups have emerged where old powers have waned, competing to claim fragments of territory from Islamic State and complicating the outlook when they win. REUTERS/Goran Tomasevic SEARCH "YBS TOMASEVIC" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES TPX IMAGES OF THE DAY
A female member of the Sinjar Resistance Units (YBS), a militia affiliated with the Kurdistan Workers' Party (PKK), carries a sniper and an AK-47 rifle in the village of Umm al-Dhiban, northern Iraq, April 29, 2016. They share little more than an enemy and struggle to communicate on the battlefield, but together two relatively obscure groups have opened up a new front against Islamic State militants in a remote corner of Iraq. The unlikely alliance between the Sinjar Resistance Units, an offshoot of a leftist Kurdish organisation, and Abdulkhaleq al-Jarba, a Arab tribal militia is a measure of the extent to which Islamic State has upended the regional order. Across Iraq and Syria, new groups have emerged where old powers have waned, competing to claim fragments of territory from Islamic State and complicating the outlook when they win. REUTERS/Goran Tomasevic SEARCH "YBS TOMASEVIC" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES
Members of the Sinjar Resistance Units (YBS), a militia affiliated with the Kurdistan Workers' Party (PKK), detonate improvised explosive devices captured from Islamic State fighters near village of Umm al-Dhiban, northern Iraq, April 30, 2016. They share little more than an enemy and struggle to communicate on the battlefield, but together two relatively obscure groups have opened up a new front against Islamic State militants in a remote corner of Iraq. The unlikely alliance between the Sinjar Resistance Units, an offshoot of a leftist Kurdish organisation, and Abdulkhaleq al-Jarba, a Arab tribal militia is a measure of the extent to which Islamic State has upended the regional order. Across Iraq and Syria, new groups have emerged where old powers have waned, competing to claim fragments of territory from Islamic State and complicating the outlook when they win. REUTERS/Goran Tomasevic SEARCH "YBS TOMASEVIC" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES
A burned copy of the Muslim holy book, the Koran, is seen in a mosque that was torched in Sinjar town, Iraq, May 1, 2016. They share little more than an enemy and struggle to communicate on the battlefield, but together two relatively obscure groups have opened up a new front against Islamic State militants in a remote corner of Iraq. The unlikely alliance between the Sinjar Resistance Units, an offshoot of a leftist Kurdish organisation, and Abdulkhaleq al-Jarba, a Arab tribal militia is a measure of the extent to which Islamic State has upended the regional order. Across Iraq and Syria, new groups have emerged where old powers have waned, competing to claim fragments of territory from Islamic State and complicating the outlook when they win. REUTERS/Goran Tomasevic SEARCH "YBS TOMASEVIC" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES
Members of the Sinjar Resistance Units (YBS), a militia affiliated with the Kurdistan Workers' Party (PKK), disarm an improvised explosive device placed by Islamic State fighters near the village of Umm al-Dhiban, northern Iraq, April 30, 2016. They share little more than an enemy and struggle to communicate on the battlefield, but together two relatively obscure groups have opened up a new front against Islamic State militants in a remote corner of Iraq. The unlikely alliance between the Sinjar Resistance Units, an offshoot of a leftist Kurdish organisation, and Abdulkhaleq al-Jarba, a Arab tribal militia is a measure of the extent to which Islamic State has upended the regional order. Across Iraq and Syria, new groups have emerged where old powers have waned, competing to claim fragments of territory from Islamic State and complicating the outlook when they win. REUTERS/Goran Tomasevic SEARCH "YBS TOMASEVIC" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES
Members of the Sinjar Resistance Units (YBS), a militia affiliated with the Kurdistan Workers' Party (PKK), carry improvised explosive devices to place on a track used by Islamic State fighters near village of Umm al-Dhiban, northern Iraq, April 29, 2016. They share little more than an enemy and struggle to communicate on the battlefield, but together two relatively obscure groups have opened up a new front against Islamic State militants in a remote corner of Iraq. The unlikely alliance between the Sinjar Resistance Units, an offshoot of a leftist Kurdish organisation, and Abdulkhaleq al-Jarba, a Arab tribal militia is a measure of the extent to which Islamic State has upended the regional order. Across Iraq and Syria, new groups have emerged where old powers have waned, competing to claim fragments of territory from Islamic State and complicating the outlook when they win. REUTERS/Goran Tomasevic SEARCH "YBS TOMASEVIC" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES
Members of the Sinjar Resistance Units (YBS), a militia affiliated with the Kurdistan Workersà Party (PKK), stand in the village of Umm al-Dhiban, northern Iraq, April 29, 2016. They share little more than an enemy and struggle to communicate on the battlefield, but together two relatively obscure groups have opened up a new front against Islamic State militants in a remote corner of Iraq. The unlikely alliance between the Sinjar Resistance Units, an offshoot of a leftist Kurdish organisation, and Abdulkhaleq al-Jarba, a Arab tribal militia is a measure of the extent to which Islamic State has upended the regional order. Across Iraq and Syria, new groups have emerged where old powers have waned, competing to claim fragments of territory from Islamic State and complicating the outlook when they win. REUTERS/Goran Tomasevic SEARCH "YBS TOMASEVIC" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES
A member of the Sinjar Resistance Units (YBS), a militia affiliated with the Kurdistan Workers' Party (PKK), disarms an improvised explosive device placed by Islamic State fighters near the village of Umm al-Dhiban, northern Iraq, April 30, 2016. They share little more than an enemy and struggle to communicate on the battlefield, but together two relatively obscure groups have opened up a new front against Islamic State militants in a remote corner of Iraq. The unlikely alliance between the Sinjar Resistance Units, an offshoot of a leftist Kurdish organisation, and Abdulkhaleq al-Jarba, a Arab tribal militia is a measure of the extent to which Islamic State has upended the regional order. Across Iraq and Syria, new groups have emerged where old powers have waned, competing to claim fragments of territory from Islamic State and complicating the outlook when they win. REUTERS/Goran Tomasevic SEARCH "YBS TOMASEVIC" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES
A member of the Sinjar Resistance Units (YBS), a militia affiliated with the Kurdistan Workersà Party (PKK), disarms an improvised explosive device placed by Islamic State fighters near the village of Umm al-Dhiban, northern Iraq, April 30, 2016. They share little more than an enemy and struggle to communicate on the battlefield, but together two relatively obscure groups have opened up a new front against Islamic State militants in a remote corner of Iraq. The unlikely alliance between the Sinjar Resistance Units, an offshoot of a leftist Kurdish organisation, and Abdulkhaleq al-Jarba, a Arab tribal militia is a measure of the extent to which Islamic State has upended the regional order. Across Iraq and Syria, new groups have emerged where old powers have waned, competing to claim fragments of territory from Islamic State and complicating the outlook when they win. REUTERS/Goran Tomasevic SEARCH "YBS TOMASEVIC" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES
A female member of the Sinjar Resistance Units (YBS), a militia affiliated with the Kurdistan Workers' Party (PKK), poses for photograph at a check point in the village of Umm al-Dhiban, northern Iraq, April 30, 2016. They share little more than an enemy and struggle to communicate on the battlefield, but together two relatively obscure groups have opened up a new front against Islamic State militants in a remote corner of Iraq. The unlikely alliance between the Sinjar Resistance Units, an offshoot of a leftist Kurdish organisation, and Abdulkhaleq al-Jarba, a Arab tribal militia is a measure of the extent to which Islamic State has upended the regional order. Across Iraq and Syria, new groups have emerged where old powers have waned, competing to claim fragments of territory from Islamic State and complicating the outlook when they win. REUTERS/Goran Tomasevic SEARCH "YBS TOMASEVIC" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES
A member of the Sinjar Resistance Units (YBS), a militia affiliated with the Kurdistan Workers' Party (PKK), carries a disarmed improvised explosive device which was placed by Islamic State fighters near the village of Umm al-Dhiban, northern Iraq, April 30, 2016. They share little more than an enemy and struggle to communicate on the battlefield, but together two relatively obscure groups have opened up a new front against Islamic State militants in a remote corner of Iraq. The unlikely alliance between the Sinjar Resistance Units, an offshoot of a leftist Kurdish organisation, and Abdulkhaleq al-Jarba, a Arab tribal militia is a measure of the extent to which Islamic State has upended the regional order. Across Iraq and Syria, new groups have emerged where old powers have waned, competing to claim fragments of territory from Islamic State and complicating the outlook when they win. REUTERS/Goran Tomasevic SEARCH "YBS TOMASEVIC" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES
A member of the Sinjar Resistance Units (YBS), a militia affiliated with the Kurdistan Workers' Party (PKK), disarms an improvised explosive device placed by Islamic States fighters near the village of Umm al-Dhiban, northern Iraq, April 30, 2016. They share little more than an enemy and struggle to communicate on the battlefield, but together two relatively obscure groups have opened up a new front against Islamic State militants in a remote corner of Iraq. The unlikely alliance between the Sinjar Resistance Units, an offshoot of a leftist Kurdish organisation, and Abdulkhaleq al-Jarba, a Arab tribal militia is a measure of the extent to which Islamic State has upended the regional order. Across Iraq and Syria, new groups have emerged where old powers have waned, competing to claim fragments of territory from Islamic State and complicating the outlook when they win. REUTERS/Goran Tomasevic SEARCH "YBS TOMASEVIC" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES
A member of the Sinjar Resistance Units (YBS), a militia affiliated with the Kurdistan Workers' Party (PKK), holds a disarmed suicide bomber's vest captured from Islamic State fighters near the village of Umm al-Dhiban, northern Iraq, April 30, 2016. They share little more than an enemy and struggle to communicate on the battlefield, but together two relatively obscure groups have opened up a new front against Islamic State militants in a remote corner of Iraq. The unlikely alliance between the Sinjar Resistance Units, an offshoot of a leftist Kurdish organisation, and Abdulkhaleq al-Jarba, a Arab tribal militia is a measure of the extent to which Islamic State has upended the regional order. Across Iraq and Syria, new groups have emerged where old powers have waned, competing to claim fragments of territory from Islamic State and complicating the outlook when they win. REUTERS/Goran Tomasevic SEARCH "YBS TOMASEVIC" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES
Bullets lie next to a gun at a Sinjar Resistance Units (YBS) check point, a militia affiliated with the Kurdistan Workersà Party (PKK), in the village of Umm al-Dhiban, northern Iraq, April 30, 2016. They share little more than an enemy and struggle to communicate on the battlefield, but together two relatively obscure groups have opened up a new front against Islamic State militants in a remote corner of Iraq. The unlikely alliance between the Sinjar Resistance Units, an offshoot of a leftist Kurdish organisation, and Abdulkhaleq al-Jarba, a Arab tribal militia is a measure of the extent to which Islamic State has upended the regional order. Across Iraq and Syria, new groups have emerged where old powers have waned, competing to claim fragments of territory from Islamic State and complicating the outlook when they win. REUTERS/Goran Tomasevic SEARCH "YBS TOMASEVIC" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES
Members of the Sinjar Resistance Units (YBS), a militia affiliated with the Kurdistan Workersà Party (PKK), carry improvised explosive devices to place on a track used by Islamic State fighters near the village of Umm al-Dhiban, northern Iraq, April 29, 2016. They share little more than an enemy and struggle to communicate on the battlefield, but together two relatively obscure groups have opened up a new front against Islamic State militants in a remote corner of Iraq. The unlikely alliance between the Sinjar Resistance Units, an offshoot of a leftist Kurdish organisation, and Abdulkhaleq al-Jarba, a Arab tribal militia is a measure of the extent to which Islamic State has upended the regional order. Across Iraq and Syria, new groups have emerged where old powers have waned, competing to claim fragments of territory from Islamic State and complicating the outlook when they win. REUTERS/Goran Tomasevic SEARCH "YBS TOMASEVIC" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES TPX IMAGES OF THE DAY
Members of the Sinjar Resistance Units (YBS), a militia affiliated with the Kurdistan Workers' Party (PKK), place a trip wired improvised explosive device on a track used by Islamic State fighters near village of Umm al-Dhiban, northern Iraq, April 30, 2016. They share little more than an enemy and struggle to communicate on the battlefield, but together two relatively obscure groups have opened up a new front against Islamic State militants in a remote corner of Iraq. The unlikely alliance between the Sinjar Resistance Units, an offshoot of a leftist Kurdish organisation, and Abdulkhaleq al-Jarba, a Arab tribal militia is a measure of the extent to which Islamic State has upended the regional order. Across Iraq and Syria, new groups have emerged where old powers have waned, competing to claim fragments of territory from Islamic State and complicating the outlook when they win. REUTERS/Goran Tomasevic SEARCH "YBS TOMASEVIC" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES
Members of the Sinjar Resistance Units (YBS), a militia affiliated with the Kurdistan Workersà Party (PKK), rest at a checkpoint in the village of Umm al-Dhiban, northern Iraq, April 30, 2016. They share little more than an enemy and struggle to communicate on the battlefield, but together two relatively obscure groups have opened up a new front against Islamic State militants in a remote corner of Iraq. The unlikely alliance between the Sinjar Resistance Units, an offshoot of a leftist Kurdish organisation, and Abdulkhaleq al-Jarba, a Arab tribal militia is a measure of the extent to which Islamic State has upended the regional order. Across Iraq and Syria, new groups have emerged where old powers have waned, competing to claim fragments of territory from Islamic State and complicating the outlook when they win. REUTERS/Goran Tomasevic SEARCH "YBS TOMASEVIC" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES
A member of the Sinjar Resistance Units (YBS), a militia affiliated with the Kurdistan Workersà Party (PKK), disarms an improvised explosive device placed by Islamic State fighters near village of Umm al-Dhiban, northern Iraq, April 30, 2016. They share little more than an enemy and struggle to communicate on the battlefield, but together two relatively obscure groups have opened up a new front against Islamic State militants in a remote corner of Iraq. The unlikely alliance between the Sinjar Resistance Units, an offshoot of a leftist Kurdish organisation, and Abdulkhaleq al-Jarba, a Arab tribal militia is a measure of the extent to which Islamic State has upended the regional order. Across Iraq and Syria, new groups have emerged where old powers have waned, competing to claim fragments of territory from Islamic State and complicating the outlook when they win. REUTERS/Goran Tomasevic SEARCH "YBS TOMASEVIC" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES
Members of the Sinjar Resistance Units (YBS), a militia affiliated with the Kurdistan Workers' Party (PKK), place an improvised explosive device on a track used by Islamic State fighters near village of Umm al-Dhiban, northern Iraq, April 29, 2016. They share little more than an enemy and struggle to communicate on the battlefield, but together two relatively obscure groups have opened up a new front against Islamic State militants in a remote corner of Iraq. The unlikely alliance between the Sinjar Resistance Units, an offshoot of a leftist Kurdish organisation, and Abdulkhaleq al-Jarba, a Arab tribal militia is a measure of the extent to which Islamic State has upended the regional order. Across Iraq and Syria, new groups have emerged where old powers have waned, competing to claim fragments of territory from Islamic State and complicating the outlook when they win. REUTERS/Goran Tomasevic SEARCH "YBS TOMASEVIC" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES
A member of Sinjar Resistance Units (YBS), a militia affiliated with the Kurdistan Workersà Party (PKK), walks at a check point in the village of Umm al-Dhiban, Iraq, April 30, 2016. They share little more than an enemy and struggle to communicate on the battlefield, but together two relatively obscure groups have opened up a new front against Islamic State militants in a remote corner of Iraq. The unlikely alliance between the Sinjar Resistance Units, an offshoot of a leftist Kurdish organisation, and Abdulkhaleq al-Jarba, a Arab tribal militia is a measure of the extent to which Islamic State has upended the regional order. Across Iraq and Syria, new groups have emerged where old powers have waned, competing to claim fragments of territory from Islamic State and complicating the outlook when they win. REUTERS/Goran Tomasevic SEARCH "YBS TOMASEVIC" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES
A member of Sinjar Resistance Units (YBS), a militia affiliated with the Kurdistan Workersà Party (PKK), places an improvised explosive device on a track used by Islamic State fighters near the village of Umm al-Dhiban, northern Iraq, April 29, 2016. They share little more than an enemy and struggle to communicate on the battlefield, but together two relatively obscure groups have opened up a new front against Islamic State militants in a remote corner of Iraq. The unlikely alliance between the Sinjar Resistance Units, an offshoot of a leftist Kurdish organisation, and Abdulkhaleq al-Jarba, a Arab tribal militia is a measure of the extent to which Islamic State has upended the regional order. Across Iraq and Syria, new groups have emerged where old powers have waned, competing to claim fragments of territory from Islamic State and complicating the outlook when they win. REUTERS/Goran Tomasevic SEARCH "YBS TOMASEVIC" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES
A mosque that was torched is seen in Sinjar town, Iraq May 1, 2016. They share little more than an enemy and struggle to communicate on the battlefield, but together two relatively obscure groups have opened up a new front against Islamic State militants in a remote corner of Iraq. The unlikely alliance between the Sinjar Resistance Units, an offshoot of a leftist Kurdish organisation, and Abdulkhaleq al-Jarba, a Arab tribal militia is a measure of the extent to which Islamic State has upended the regional order. Across Iraq and Syria, new groups have emerged where old powers have waned, competing to claim fragments of territory from Islamic State and complicating the outlook when they win. REUTERS/Goran Tomasevic SEARCH "YBS TOMASEVIC" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES
Members of the Sinjar Resistance Units (YBS), a militia affiliated with the Kurdistan Workersà Party (PKK), stand in the village of Umm al-Dhiban, northern Iraq, April 29, 2016. They share little more than an enemy and struggle to communicate on the battlefield, but together two relatively obscure groups have opened up a new front against Islamic State militants in a remote corner of Iraq. The unlikely alliance between the Sinjar Resistance Units, an offshoot of a leftist Kurdish organisation, and Abdulkhaleq al-Jarba, a Arab tribal militia is a measure of the extent to which Islamic State has upended the regional order. Across Iraq and Syria, new groups have emerged where old powers have waned, competing to claim fragments of territory from Islamic State and complicating the outlook when they win. REUTERS/Goran Tomasevic SEARCH "YBS TOMASEVIC" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES TPX IMAGES OF THE DAY
A female member of the Sinjar Resistance Units (YBS), a militia affiliated with the Kurdistan Workers' Party (PKK), smiles as she holds a sniper rifle in the village of Umm al-Dhiban, northern Iraq, April 29, 2016. They share little more than an enemy and struggle to communicate on the battlefield, but together two relatively obscure groups have opened up a new front against Islamic State militants in a remote corner of Iraq. The unlikely alliance between the Sinjar Resistance Units, an offshoot of a leftist Kurdish organisation, and Abdulkhaleq al-Jarba, a Arab tribal militia is a measure of the extent to which Islamic State has upended the regional order. Across Iraq and Syria, new groups have emerged where old powers have waned, competing to claim fragments of territory from Islamic State and complicating the outlook when they win. REUTERS/Goran Tomasevic SEARCH "YBS TOMASEVIC" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES
A torn poster with instructions for Muslim prayer hangs on a wall in a mosque that was torched in Sinjar town, Iraq, May 1, 2016. They share little more than an enemy and struggle to communicate on the battlefield, but together two relatively obscure groups have opened up a new front against Islamic State militants in a remote corner of Iraq. The unlikely alliance between the Sinjar Resistance Units, an offshoot of a leftist Kurdish organisation, and Abdulkhaleq al-Jarba, a Arab tribal militia is a measure of the extent to which Islamic State has upended the regional order. Across Iraq and Syria, new groups have emerged where old powers have waned, competing to claim fragments of territory from Islamic State and complicating the outlook when they win. REUTERS/Goran Tomasevic SEARCH "YBS TOMASEVIC" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES
A picture of jailed Kurdistan Workersà Party (PKK) leader Abdullah Ocalan is seen in a PKK mausoleum in Sinjar region, northern Iraq, May 1, 2016. They share little more than an enemy and struggle to communicate on the battlefield, but together two relatively obscure groups have opened up a new front against Islamic State militants in a remote corner of Iraq. The unlikely alliance between the Sinjar Resistance Units, an offshoot of a leftist Kurdish organisation, and Abdulkhaleq al-Jarba, a Arab tribal militia is a measure of the extent to which Islamic State has upended the regional order. Across Iraq and Syria, new groups have emerged where old powers have waned, competing to claim fragments of territory from Islamic State and complicating the outlook when they win. REUTERS/Goran Tomasevic SEARCH "YBS TOMASEVIC" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES
Pictures of Sinjar Resistance Units (YBS) fighters, a militia affiliated with the Kurdistan Workersà Party (PKK) and PKK fighters are seen in a PKK mausoleum in Sinjar region, northern Iraq, May 1, 2016. They share little more than an enemy and struggle to communicate on the battlefield, but together two relatively obscure groups have opened up a new front against Islamic State militants in a remote corner of Iraq. The unlikely alliance between the Sinjar Resistance Units, an offshoot of a leftist Kurdish organisation, and Abdulkhaleq al-Jarba, a Arab tribal militia is a measure of the extent to which Islamic State has upended the regional order. Across Iraq and Syria, new groups have emerged where old powers have waned, competing to claim fragments of territory from Islamic State and complicating the outlook when they win. REUTERS/Goran Tomasevic SEARCH "YBS TOMASEVIC" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES
Kurdistan Workers' Party (PKK) fighters leave a PKK mausoleum in Sinjar region, northern Iraq, May 1, 2016. They share little more than an enemy and struggle to communicate on the battlefield, but together two relatively obscure groups have opened up a new front against Islamic State militants in a remote corner of Iraq. The unlikely alliance between the Sinjar Resistance Units, an offshoot of a leftist Kurdish organisation, and Abdulkhaleq al-Jarba, a Arab tribal militia is a measure of the extent to which Islamic State has upended the regional order. Across Iraq and Syria, new groups have emerged where old powers have waned, competing to claim fragments of territory from Islamic State and complicating the outlook when they win. REUTERS/Goran Tomasevic SEARCH "YBS TOMASEVIC" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES
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UMM Al-DHIBAN, Iraq, May 11 (Reuters) - They share little more than an enemy and struggle to communicate on the battlefield, but together two relatively obscure groups have opened up a new front against Islamic State militants in a remote corner of Iraq.

The unlikely alliance between an offshoot of a leftist Kurdish organization and an Arab tribal militia in northern Iraq is a measure of the extent to which Islamic State has upended the regional order.

Across Iraq and Syria, new groups have emerged where old powers have waned, competing to claim fragments of territory from Islamic State and complicating the outlook when they win.

"Chaos sometimes produces unexpected things," said the head of the Arab tribal force, Abdulkhaleq al-Jarba. "After Daesh (Islamic State), the political map of the region has changed. There is a new reality and we are part of it."

SEE ALSO: Al-Qaida chief tells jihadist fighters in Syria: Unite or die

In Nineveh province, this "new reality" was born in 2014 when official security forces failed to defend the Sinjar area against the Sunni Islamic State militants who purged its Yazidi population.

A Syrian affiliate of the Kurdistan Workers' Party (PKK) came to the rescue, which won the gratitude of Yazidis, and another local franchise called the Sinjar Resistance Units (YBS) was set up.

The mainly Kurdish secular group, which includes Yazidis, controls a pocket of territory in Sinjar and recently formed an alliance with a Sunni Arab militia drawn from the powerful Shammar tribe.

"In the beginning we were unsure (about them)," said a wiry older member of the Arab force, which was assembled over the past three months and is now more than 400-strong. "We thought they were Kurdish occupiers."

Their cooperation is all the more unusual because many Yazidis accuse their Sunni Muslim neighbors of complicity in atrocities committed against them by Islamic State, and say they cannot live together again.

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Last month, the YBS-Shammar alliance won its first joint victory against Islamic State in the village of Umm al-Dhiban, a cluster of adobe houses along a highway near the Syrian border, where they are now fortifying their positions.

On his hands and knees, a YBS fighter from Sinjar gently loosens a patch of earth with a knife, prising out an unexploded bomb to be used against the militants who planted it there before being pushed back several kilometers.

Taking turns with a pick-axe, two other guerrillas hack at the ground until the hole they are making on the edge of a dirt track is large enough to fit two explosive charges that will detonate when Islamic State drives past.

The fighters plan to retake other Arab and Yazidi villages in the area, and say they will join the campaign for Islamic State's biggest stronghold, around 160 km (100 miles) to the east: "By the will of God, we will enter Mosul," Jarba said.

DIFFERENT AGENDAS

Although fighting Islamic State has given them common purpose, the two sides' agendas appear hard to reconcile.

While the Arab militia wants to restore Baghdad's authority over this arid hinterland, the YBS is on a mission to establish its own model of society based on the philosophy of PKK leader Abdullah Ocalan.

Ocalan took the PKK to war against Turkey in 1984 seeking statehood for Kurds, but now advocates a form of grassroots democracy as opposed to state control.

"When the comrades liberate a village, they let the community decide for itself," said 18-year old Evin, a Kurdish fighter from Syria who joined the PKK's affiliate there before coming to Sinjar. "The leader's ideology is not just for Kurds."

That may be so, but the ideology is alien to the conservative, tribal society in parts of northern Iraq.

The Arab fighters have only a vague notion of the man whose mustachioed image decorates YBS fighters' fatigues and a flag now flying beside Iraq's at the entrance to Umm al-Dhiban.

"Our life is very different from the life of the Shammar," said a guerrilla from Turkey who is trying to learn some Arabic so he can communicate with them. "We are an ideological force and they are not."

The faultline is most visible in the presence of female fighters in the ranks of the YBS -- unusual in a male-dominated part of the world where the sexes are often segregated and women confined to the home.

One named Hevidar said the Arab fighters initially avoided talking to her and the other women. "After a month or two they learned," she said, toying with a walkie-talkie as a voice broke through the static, calling "Heval!" (Comrade).

Abu Hazaa, a commander of the Arab force, admitted being taken aback by the female fighters: "We thought women were easily frightened, but that view has changed," he said at a joint military outpost in what used to be a medical center.

The suggestion that women from his own community could also be deployed provoked laughter.

"We are a tribal society," Abu Hazaa said. "We have our customs and traditions and nobody can contravene them."

MARRIAGE OF EXPEDIENCE

For now, the external forces pushing the two groups together are stronger than the differences that could drive them apart.

The Arab militia lacks the experience to take on Islamic State without the YBS, whose ranks are stiffened with veterans of the PKK's three-decade insurgency against Ankara.

"They are fierce fighters," said Jarba. "They have experience in guerrilla warfare (and) we can benefit from that."

For the YBS, partnering with a local Arab force makes them look less like invaders as they push into areas where Kurds are in the minority.

The alliance is supported by the central government in Baghdad, which has put both forces on the payroll to regain a foothold in the area, where it has no troops of its own.

Baghdad also hopes the two will help curb the ambitions of its autonomous Kurdistan region, whose peshmerga forces have recaptured large areas from Islamic State in the north, effectively annexing territory claimed by Baghdad, including parts of Sinjar.

In turn, Kurdish regional authorities are blockading the Arab militia and the YBS. Although both Kurdish, the PKK and its affiliates are rivals of the autonomous region.

Some members of the Shammar tribe have sided with the peshmerga in Sinjar. But Abu Hazaa said the only flag he would raise was Iraq's. "We don't want to be subjected to anyone but the central government."

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