Mattis warns of 'clear and present danger' North Korea poses

The United States is encouraged by China's efforts to restrain North Korea but Washington will not accept Beijing's militarization of islands in the South China Sea, U.S. Defense Secretary Jim Mattis said on Saturday.

The comments by Mattis, during the annual Shangri-La Dialogue, show how U.S. President Donald Trump's administration is looking to balance working with China to restrain North Korea's advancing missile and nuclear programs while dealing with Beijing's activities in the South China Sea.

"Coupled with reckless proclamations, the current North Korean program signals a clear intent to acquire nuclear-armed ballistic missiles, including those of intercontinental range, that pose direct and immediate threats to our regional allies, our partners and all the world," Mattis said.

"As a matter of U.S. national security, the U.S. regards the threat from North Korea as a clear and present danger," he added.

SEE MORE: US issues new sanctions on North Korea over arms program

U.S. allies have been worried by Trump's actively courting Chinese President Xi Jinping to restrain North Korea, fearing Washington might allow China a more free rein elsewhere in the region.

Some allies have also expressed concern that Washington's withdrawal from the Trans-Pacific trade partnership and the Paris global climate accord signals the United States is diluting its global leadership role.

Speaking at the dialog, Asia's premier security forum, Mattis said the United States remained fully engaged with its partners.

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North Korea's Missiles
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North Korea's Missiles
The scene of the intermediate-range ballistic missile Pukguksong-2's launch test in this undated photo released by North Korea's Korean Central News Agency (KCNA) May 22, 2017. KCNA/via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. EDITORIAL USE ONLY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THIS IMAGE. NO THIRD PARTY SALES. SOUTH KOREA OUT.
The long-range strategic ballistic rocket Hwasong-12 (Mars-12) is launched during a test in this undated photo released by North Korea's Korean Central News Agency (KCNA) on May 15, 2017. KCNA via REUTERS REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. EDITORIAL USE ONLY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THIS IMAGE. NO THIRD PARTY SALES. SOUTH KOREA OUT.
Missiles are driven past the stand with North Korean leader Kim Jong Un and other high ranking officials during a military parade marking the 105th birth anniversary of North Korea's founding father, Kim Il Sung, in Pyongyang, April 15, 2017. REUTERS/Sue-Lin Wong
North Korean leader Kim Jong Un inspects the long-range strategic ballistic rocket Hwasong-12 (Mars-12) in this undated photo released by North Korea's Korean Central News Agency (KCNA) on May 15, 2017. KCNA via REUTERS REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. EDITORIAL USE ONLY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THIS IMAGE. NO THIRD PARTY SALES. SOUTH KOREA OUT. TPX IMAGES OF THE DAY
People cheer as a missile is driven past the stand with North Korean leader Kim Jong Un and other high ranking officials during a military parade marking the 105th birth anniversary of country's founding father Kim Il Sung, in Pyongyang April 15, 2017. REUTERS/Damir Sagolj
Military vehicles carry missiles with characters reading 'Pukkuksong' during a military parade marking the 105th birth anniversary of country's founding father, Kim Il Sung in Pyongyang, April 15, 2017. REUTERS/Damir Sagolj TPX IMAGES OF THE DAY
North Korean leader Kim Jong Un supervised a ballistic rocket launching drill of Hwasong artillery units of the Strategic Force of the KPA on the spot in this undated photo released by North Korea's Korean Central News Agency (KCNA) in Pyongyang March 7, 2017. KCNA/via REUTERSATTENTION EDITORS - THIS PICTURE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THE AUTHENTICITY, CONTENT, LOCATION OR DATE OF THIS IMAGE. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. NO THIRD PARTY SALES. NOT FOR USE BY REUTERS THIRD PARTY DISTRIBUTORS. SOUTH KOREA OUT. NO COMMERCIAL OR EDITORIAL SALES IN SOUTH KOREA. TPX IMAGES OF THE DAY
A fire drill of ballistic rockets by Hwasong artillery units of the KPA Strategic Force is pictured in this undated photo released by North Korea's Korean Central News Agency (KCNA) in Pyongyang September 6, 2016. KCNA/via Reuters ATTENTION EDITORS - THIS PICTURE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THE AUTHENTICITY, CONTENT, LOCATION OR DATE OF THIS IMAGE. FOR EDITORIAL USE ONLY. NO THIRD PARTY SALES. SOUTH KOREA OUT. THIS PICTURE IS DISTRIBUTED EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS.
FILE PHOTO - An underwater test-firing of a strategic submarine ballistic missile is seen in this undated photo released by North Korea's Korean Central News Agency (KCNA) in Pyongyang on April 24, 2016. KCNA/File Photo via REUTERS. ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. EDITORIAL USE ONLY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THIS IMAGE. SOUTH KOREA OUT.
A view of a firing contest among multiple launch rocket system (MLRS) batteries selected from large combined units of the KPA, in this undated photo released by North Korea's Korean Central News Agency (KCNA) in Pyongyang on December 21, 2016. KCNA/via Reuters ATTENTION EDITORS - THIS PICTURE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THE AUTHENTICITY, CONTENT, LOCATION OR DATE OF THIS IMAGE. FOR EDITORIAL USE ONLY. NO THIRD PARTY SALES. SOUTH KOREA OUT. THIS PICTURE IS DISTRIBUTED EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS.
Ballistic rocket is seen launching during a drill by the Hwasong artillery units of the KPA Strategic Force in this undated picture provided by KCNA in Pyongyang on July 21, 2016. KCNA/via ReutersATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. EDITORIAL USE ONLY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THIS IMAGE. SOUTH KOREA OUT. NO THIRD PARTY SALES. NOT FOR USE BY REUTERS THIRD PARTY DISTRIBUTORS.Ã TPX IMAGES OF THE DAY
A test launch of ground-to-ground medium long-range ballistic rocket Hwasong-10 in this undated photo released by North Korea's Korean Central News Agency (KCNA) on June 23, 2016. REUTERS/KCNA ATTENTION EDITORS - THIS PICTURE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THE AUTHENTICITY, CONTENT, LOCATION OR DATE OF THIS IMAGE. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. NO THIRD PARTY SALES. NOT FOR USE BY REUTERS THIRD PARTY DISTRIBUTORS. SOUTH KOREA OUT. NO COMMERCIAL OR EDITORIAL SALES IN SOUTH KOREA. THIS PICTURE IS DISTRIBUTED EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS. TPX IMAGES OF THE DAY
A new multiple launch rocket system is test fired in this undated photo released by North Korea's Korean Central News Agency (KCNA) in Pyongyang March 4, 2016. REUTERS/KCNA ATTENTION EDITORS - THIS PICTURE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THE AUTHENTICITY, CONTENT, LOCATION OR DATE OF THIS IMAGE. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. THIS PICTURE IS DISTRIBUTED EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS. NO THIRD PARTY SALES. SOUTH KOREA OUT. NO COMMERCIAL OR EDITORIAL SALES IN SOUTH KOREA
A rocket is launched during a demonstration of a new large-caliber multiple rocket launching system attended by North Korean leader Kim Jong Un (not pictured) at an unknown location, in this undated file photo released by North Korea's Korean Central News Agency (KCNA) on March 22, 2016. REUTERS/KCNA/Files ATTENTION EDITORS - THIS PICTURE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THE AUTHENTICITY, CONTENT, LOCATION OR DATE OF THIS IMAGE. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. NO THIRD PARTY SALES. SOUTH KOREA OUT. NO COMMERCIAL OR EDITORIAL SALES IN SOUTH KOREA. THIS PICTURE IS DISTRIBUTED EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS. TPX IMAGES OF THE DAY
A rocket is fired during a drill by anti-aircraft units of the Korean People's Army (KPA) in this undated photo released by North Korea's Korean Central News Agency (KCNA) in Pyongyang November 3, 2015. REUTERS/KCNA ATTENTION EDITORS - THIS PICTURE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THE AUTHENTICITY, CONTENT, LOCATION OR DATE OF THIS IMAGE. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. THIS PICTURE IS DISTRIBUTED EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS. NO THIRD PARTY SALES. SOUTH KOREA OUT. NO COMMERCIAL OR EDITORIAL SALES IN SOUTH KOREA.
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"Like it or not, we are a part of the world...What a crummy world if we all retreat inside our borders," he said.

"Once we have exhausted all possible alternatives, the Americans will do the right thing," Mattis added, paraphrasing a quotation by British wartime leader Winston Churchill. "So we will still be there and we will be there with you."

Nevertheless, reversing or slowing North Korea's nuclear and missile programs has become a security priority for Washington, given Pyongyang's vow to develop a nuclear-tipped missile capable of hitting the U.S. mainland.

The Trump administration has been pressing China aggressively to rein in its reclusive neighbor, warning all options are on the table if North Korea persists with its weapons programs.

"The Trump administration is encouraged by China's renewed commitment to work with the international community toward denuclearization," Mattis said.

"Ultimately, we believe China will come to recognize North Korea as a strategic liability, not an asset."

However, Mattis said seeking China's cooperation on North Korea did not mean Washington would not challenge Beijing's activities in the South China Sea.

14 PHOTOS
Disputes over islands in the South China Sea
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Disputes over islands in the South China Sea
SUBI REEF, SOUTH CHINA SEA - SEPTEMBER 1, 2015: DigitalGlobe high-resolution imagery of the Subi Reef in the South China Sea, a part of the Spratly Islands group. Image progression. Photo DigitalGlobe via Getty Images.
FIERY CROSS REEF, SOUTH CHINA SEA - SEPTEMBER 3, 2015: DigitalGlobe imagery of the nearly completed construction within the Fiery Cross Reef located in the South China Sea. Fiery Cross is located in the western part of the Spratly Islands group. Photo DigitalGlobe via Getty Images.
SUBI REEF, SOUTH CHINA SEA - MARCH 17, 2015: DigitalGlobe imagery of the Subi Reef in the South China Sea, a part of the Spratly Islands group. Image progression #2 of 3. Photo DigitalGlobe via Getty Images.
SUBI REEF, SOUTH CHINA SEA - AUGUST 1, 2015: DigitalGlobe imagery of the Subi Reef in the South China Sea, a part of the Spratly Islands group. Close up image 2 of 2. Photo DigitalGlobe via Getty Images.
SUBI REEF, SOUTH CHINA SEA - SEPTEMBER 1, 2015: DigitalGlobe high-resolution imagery of the Subi Reef in the South China Sea, a part of the Spratly Islands group. Image progression. Photo DigitalGlobe via Getty Images.
SUBI REEF, SOUTH CHINA SEA - AUGUST 1, 2015: DigitalGlobe imagery of the Subi Reef in the South China Sea, a part of the Spratly Islands group. Close up image 1 of 2. Photo DigitalGlobe via Getty Images.
Philippine and US Marines aboard riverine patrol boats take position during a beach landing as part of their annual joint naval exercises at a marine base in Ternate, Cavite province, west of Manila on October 8, 2015. The Philippines in late August asked the US to provide military 'assistance' in resupplying and rotating Manila's forces in the South China Sea because they face harassment from regional power China, a military spokesman said . AFP PHOTO / TED ALJIBE (Photo credit should read TED ALJIBE/AFP/Getty Images)
Philippine and US Marines board riverine patrol boats during a beach landing exercise as part of their annual joint naval exercises at a marine base in Ternate, Cavite province, west of Manila on October 8, 2015. The Philippines in late August asked the US to provide military 'assistance' in resupplying and rotating Manila's forces in the South China Sea because they face harassment from regional power China, a military spokesman said . AFP PHOTO / TED ALJIBE (Photo credit should read TED ALJIBE/AFP/Getty Images)
Philippine Marines maneuver during a live fire exercise as part of the US-Philippines annual joint naval exercises facing the South China Sea at a naval training center in San Marcelino, north of Manila on October 9, 2015. The Philippines in late August asked the US to provide military 'assistance' in resupplying and rotating Manila's forces in the South China Sea because they face harassment from regional power China, a military spokesman said. AFP PHOTO / TED ALJIBE (Photo credit should read TED ALJIBE/AFP/Getty Images)
The Philippine Navy's World War II-vintage warship BRP Rajah Humabon is anchored during the navy's founding anniversary celebration at a naval station in Cavite city, west of Manila on May 25, 2015 with buildings along Roxas boulevard in Manila in the background. The Philippine navy is one of the weakest in the region relying mostly on decades-old, surplus US warships, but the Philippine government has been modernising the navy and other branches of the armed forces in the face of China's increasing aggressiveness in trying to claim most of the South China sea. AFP PHOTO / TED ALJIBE (Photo credit should read TED ALJIBE/AFP/Getty Images)
Philippine Marines take position next to a US Marine assault amphibious vehicles (AAV) during a live-fire exercise as part of the US-Philippines annual joint naval exercises facing the South China Sea at a naval training center in San Marcelino, north of Manila on October 9, 2015. The Philippines in late August asked the US to provide military 'assistance' in resupplying and rotating Manila's forces in the South China Sea because they face harassment from regional power China, a military spokesman said. AFP PHOTO / TED ALJIBE (Photo credit should read TED ALJIBE/AFP/Getty Images)
Philippine Marines simulate a beach landing exercise as part of their annual joint naval exercises with the US at a marine base in Ternate, Cavite province, west of Manila on October 8, 2015. The Philippines in late August asked the US to provide military 'assistance' in resupplying and rotating Manila's forces in the South China Sea because they face harassment from regional power China, a military spokesman said . AFP PHOTO / TED ALJIBE (Photo credit should read TED ALJIBE/AFP/Getty Images)
Filipino environmental activists display placards during a rally outside China's consular office in Manila on May 11, 2015, against China's reclamation and construction activities on islands and reefs in the Spratly Group of the South China Sea that are also claimed by the Philippines. The group is accusing China of destroying the fragile ecosystem and livelihood of fishermen during their reclamation project. AFP PHOTO / Jay DIRECTO (Photo credit should read JAY DIRECTO/AFP/Getty Images)
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The U.N. Security Council on Friday expanded targeted sanctions against North Korea after its repeated missile tests, adopting the first such resolution agreed by the United States and China since Trump took office.

In another sign of increased pressure on North Korea, Japan's navy and air force began a three-day military exercise with two U.S. aircraft carriers in the Sea of Japan on Thursday.

Japanese Defense Minister Tomomi Inada, speaking at the Singapore forum, said Tokyo backed the United States using any option to deal with North Korea, including military strikes, and was seeking a deeper alliance with Washington.

SEE MORE: Expert warns US 'may not be able to stop' North Korean nuclear missiles

But she also said she was concerned about the situation in the South China Sea and in the East China Sea.

China's claims in the South China Sea, through which about $5 trillion in ship-borne trade passes each year, are contested by Brunei, Malaysia, the Philippines, Taiwan and Vietnam. China and Japan both claim islands in the East China Sea.

LOW-KEY

China, which sent only a low-key delegation to the forum, said its ties with the United States were vital for the region.

"I believe that if China and the United States can ensure no conflict, as well as maintain mutual respect, cooperation and trust, it will contribute greatly to security in the Asia Pacific and the world," Lt Gen He Lei, the head of Beijing's delegation, told reporters.

Allies around the world have been concerned about the commitment of the United States since Trump took office on Jan. 20 because of his "America First" rhetoric and expectations that he would concentrate on a domestic agenda.

"We are still trying to figure out his (Trump's) policy in our region," said Malaysian Defense Minister Hishammuddin Hussein. "I would like to know very clearly what are the true intentions of the new administration."

SEE ALSO: Trump's continued search for new FBI chief seen as chaotic

Mattis sought to ease concerns for allies in the Asia-Pacific, saying the region was a priority and the primary effort was alliance building. He added, however, that countries must "contribute sufficiently to their own security."

In a sign of the U.S. commitment to the region, Mattis said that soon about 60 percent of overseas tactical aviation assets would be assigned to the region and he would work with the U.S. Congress on an Asia-Pacific stability initiative.

Mattis said the United States welcomed China's economic development, but he anticipated "friction" between the two countries.

"While competition between the U.S. and China, the world's two largest economies, is bound to occur, conflict is not inevitable," Mattis said.

While eager to work with China in dealing with North Korea, Mattis said the United States did not accept China placing weapons and other military assets on man-made islands in the South China Sea.

"We oppose countries militarizing artificial islands and enforcing excessive maritime claims," Mattis said. "We cannot and will not accept unilateral, coercive changes to the status quo." (Additional reporting by Kanupriya Kapoor, Masayuki Kitano and Greg Torode; Editing by Raju Gopalakrishnan and Lincoln Feast)

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