North Korea says U.S. to blame for 'worst ever situation'

North Korea complained to the United Nations on Monday about joint military exercises by the United State and South Korea, describing it as "the worst ever situation" because U.S. nuclear war equipment had been deployed ready to strike.

In a letter to U.N. Secretary-General Antonio Guterres, seen by Reuters, North Korean U.N. Ambassador Ja Song Nam said the United States was "running amok for war exercises by introducing nuclear war equipment in and around the Korean Peninsula."

Three U.S. aircraft carrier strike groups have been involved in the joint exercise in the Western Pacific in a rare show of force as President Donald Trump visits Asia. The last time three U.S. carrier strike groups exercised together in the Western Pacific was in 2007.

SEE ALSO: Trump says North Korea's Kim Jong Un insulted him by calling him 'old'

South Korea has said the joint drill, due to finish on Tuesday, was in response to North Korean nuclear and missile provocations and to show any such developments by Pyongyang can be repelled with "overwhelming force."

However, Ja said Washington was to blame for escalating tensions and accused the U.N. Security Council of ignoring "the nuclear war exercises of the United States who is hell bent on bringing catastrophic disaster to humanity."

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North Korea releases photo that appears to show new missile plan
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North Korea releases photo that appears to show new missile plan
North Korean leader Kim Jong-Un gives field guidance during a visit to the Chemical Material Institute of the Academy of Defense Science in this undated photo released by North Korea's Korean Central News Agency (KCNA) in Pyongyang on August 23, 2017. 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. 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.
North Korean leader Kim Jong-Un gives field guidance during a visit to the Chemical Material Institute of the Academy of Defense Science in this undated photo released by North Korea's Korean Central News Agency (KCNA) in Pyongyang on August 23, 2017. 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. 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.
North Korean leader Kim Jong-Un looks on during a visit to the Chemical Material Institute of the Academy of Defense Science in this undated photo released by North Korea's Korean Central News Agency (KCNA) in Pyongyang on August 23, 2017. 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. 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.
North Korean leader Kim Jong-Un looks on during a visit to the Chemical Material Institute of the Academy of Defense Science in this undated photo released by North Korea's Korean Central News Agency (KCNA) in Pyongyang on August 23, 2017. 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. 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.
North Korean leader Kim Jong-Un gives field guidance during a visit to the Chemical Material Institute of the Academy of Defense Science in this undated photo released by North Korea's Korean Central News Agency (KCNA) in Pyongyang on August 23, 2017. 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. 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.
North Korean leader Kim Jong-Un looks on during a visit to the Chemical Material Institute of the Academy of Defense Science in this undated photo released by North Korea's Korean Central News Agency (KCNA) in Pyongyang on August 23, 2017. 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. 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.
North Korean leader Kim Jong-Un looks on during a visit to the Chemical Material Institute of the Academy of Defense Science in this undated photo released by North Korea's Korean Central News Agency (KCNA) in Pyongyang on August 23, 2017. 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. 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.
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Ja asked Guterres to bring to the attention of the 15-member council - under the rarely used Article 99 of the U.N. Charter - "the danger being posed by the U.S. nuclear war exercises, which are clearly threats to international peace and security."

Tensions have soared between the United States and North Korea following a series of weapons tests by Pyongyang and a string of increasingly bellicose exchanges between Trump and North Korean leader Kim Jong Un.

SEE ALSO: North Korean soldier, shot and wounded, defects to South

Trump said in a tweet on Sunday that Kim had insulted him by calling him "old" and said he would never call the North Korean leader "short and fat."

The United States has said that all options, including military, are on the table to deal with North Korea, although its preference is for a diplomatic solution.

The U.N. Security Council has unanimously ratcheted up sanctions on North Korea over its nuclear and ballistic missile programs since 2006.

19 PHOTOS
As tensions rise, North Korea stages mass rally in Pyongyang
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As tensions rise, North Korea stages mass rally in Pyongyang
A view shows a Pyongyang city mass rally held at Kim Il Sung Square on August 9, 2017, to fully support the statement of the Democratic People's Republic of Korea (DPRK) government in this photo released on August 10, 2017 by North Korea's Korean Central News Agency (KCNA) in Pyongyang. KCNA/via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THIS IMAGE. NO THIRD PARTY SALES. SOUTH KOREA OUT. NO COMMERCIAL OR EDITORIAL SALES IN SOUTH KOREA.?
Servicepersons of the Ministry of People's Security met on August 10, 2017 to express full support for the Democratic People's Republic of Korea (DPRK) government statement, in this photo released on August 11, 2017 by North Korea's Korean Central News Agency (KCNA) in Pyongyang. KCNA/via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THIS IMAGE. NO THIRD PARTY SALES. SOUTH KOREA OUT.
A general view shows a Pyongyang city mass rally held at Kim Il Sung Square on August 9, 2017, to fully support the statement of the Democratic People's Republic of Korea (DPRK) government in this photo released on August 10, 2017 by North Korea's Korean Central News Agency (KCNA) in Pyongyang. KCNA/via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THIS IMAGE. NO THIRD PARTY SALES. SOUTH KOREA OUT. NO COMMERCIAL OR EDITORIAL SALES IN SOUTH KOREA.??
Servicepersons of the Ministry of People's Security met on August 10, 2017 to express full support for the Democratic People's Republic of Korea (DPRK) government statement, in this photo released on August 11, 2017 by North Korea's Korean Central News Agency (KCNA) in Pyongyang. KCNA/via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THIS IMAGE. NO THIRD PARTY SALES. SOUTH KOREA OUT. TPX IMAGES OF THE DAY
A general view shows a Pyongyang city mass rally held at Kim Il Sung Square on August 9, 2017, to fully support the statement of the Democratic People's Republic of Korea (DPRK) government in this photo released on August 10, 2017 by North Korea's Korean Central News Agency (KCNA) in Pyongyang. KCNA/via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THIS IMAGE. NO THIRD PARTY SALES. SOUTH KOREA OUT. NO COMMERCIAL OR EDITORIAL SALES IN SOUTH KOREA.??
A general view shows a Pyongyang city mass rally held at Kim Il Sung Square on August 9, 2017, to fully support the statement of the Democratic People's Republic of Korea (DPRK) government in this photo released on August 10, 2017 by North Korea's Korean Central News Agency (KCNA) in Pyongyang. KCNA/via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THIS IMAGE. NO THIRD PARTY SALES. SOUTH KOREA OUT. NO COMMERCIAL OR EDITORIAL SALES IN SOUTH KOREA.??
People participate in a Pyongyang city mass rally held at Kim Il Sung Square on August 9, 2017, to fully support the statement of the Democratic People's Republic of Korea (DPRK) government in this photo released on August 10, 2017 by North Korea's Korean Central News Agency (KCNA) in Pyongyang. KCNA/via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THIS IMAGE. NO THIRD PARTY SALES. SOUTH KOREA OUT. NO COMMERCIAL OR EDITORIAL SALES IN SOUTH KOREA.?
People participate in a Pyongyang city mass rally held at Kim Il Sung Square on August 9, 2017, to fully support the statement of the Democratic People's Republic of Korea (DPRK) government in this photo released on August 10, 2017 by North Korea's Korean Central News Agency (KCNA) in Pyongyang. KCNA/via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THIS IMAGE. NO THIRD PARTY SALES. SOUTH KOREA OUT. NO COMMERCIAL OR EDITORIAL SALES IN SOUTH KOREA.?
A general view shows a Pyongyang city mass rally held at Kim Il Sung Square on August 9, 2017, to fully support the statement of the Democratic People's Republic of Korea (DPRK) government in this photo released on August 10, 2017 by North Korea's Korean Central News Agency (KCNA) in Pyongyang. KCNA/via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THIS IMAGE. NO THIRD PARTY SALES. SOUTH KOREA OUT. NO COMMERCIAL OR EDITORIAL SALES IN SOUTH KOREA.
A view shows a Pyongyang city mass rally held at Kim Il Sung Square on August 9, 2017, to fully support the statement of the Democratic People's Republic of Korea (DPRK) government in this photo released on August 10, 2017 by North Korea's Korean Central News Agency (KCNA) in Pyongyang. KCNA/via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THIS IMAGE. NO THIRD PARTY SALES. SOUTH KOREA OUT. NO COMMERCIAL OR EDITORIAL SALES IN SOUTH KOREA.?
A view shows a Pyongyang city mass rally held at Kim Il Sung Square on August 9, 2017, to fully support the statement of the Democratic People's Republic of Korea (DPRK) government in this photo released on August 10, 2017 by North Korea's Korean Central News Agency (KCNA) in Pyongyang. KCNA/via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THIS IMAGE. NO THIRD PARTY SALES. SOUTH KOREA OUT. NO COMMERCIAL OR EDITORIAL SALES IN SOUTH KOREA.?
TOPSHOT - This picture taken on August 11, 2017 and released by North Korea's official Korean Central News Agency (KCNA) on August 12, 2017 shows North Korean youths and workers and trade union members holding a rally to protest the UN Security Council's 'sanctions resolution' at the compound of the Monument to Party Founding in Pyongyang. Nearly a week ago, the UN Security Council unanimously passed fresh sanctions against Pyongyang over its weapons program, including export bans, a new punishment that could cost North Korea $1 billion a year. / AFP PHOTO / KCNA VIS KNS AND AFP PHOTO / STR / South Korea OUT / REPUBLIC OF KOREA OUT ---EDITORS NOTE--- RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT 'AFP PHOTO/KCNA VIA KNS' - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS THIS PICTURE WAS MADE AVAILABLE BY A THIRD PARTY. AFP CAN NOT INDEPENDENTLY VERIFY THE AUTHENTICITY, LOCATION, DATE AND CONTENT OF THIS IMAGE. THIS PHOTO IS DISTRIBUTED EXACTLY AS RECEIVED BY AFP. / (Photo credit should read STR/AFP/Getty Images)
This picture taken on August 11, 2017 and released by North Korea's official Korean Central News Agency (KCNA) on August 12, 2017 shows North Korean youths and workers and trade union members holding a rally to protest the UN Security Council's 'sanctions resolution' at the Youth Park Open-Air theatre in Pyongyang. Nearly a week ago, the UN Security Council unanimously passed fresh sanctions against Pyongyang over its weapons program, including export bans, a new punishment that could cost North Korea $1 billion a year. / AFP PHOTO / KCNA VIS KNS AND AFP PHOTO / STR / South Korea OUT / REPUBLIC OF KOREA OUT ---EDITORS NOTE--- RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT 'AFP PHOTO/KCNA VIA KNS' - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS THIS PICTURE WAS MADE AVAILABLE BY A THIRD PARTY. AFP CAN NOT INDEPENDENTLY VERIFY THE AUTHENTICITY, LOCATION, DATE AND CONTENT OF THIS IMAGE. THIS PHOTO IS DISTRIBUTED EXACTLY AS RECEIVED BY AFP. / (Photo credit should read STR/AFP/Getty Images)
A view shows a Pyongyang city mass rally held at Kim Il Sung Square on August 9, 2017, to fully support the statement of the Democratic People's Republic of Korea (DPRK) government in this photo released on August 10, 2017 by North Korea's Korean Central News Agency (KCNA) in Pyongyang. KCNA/via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THIS IMAGE. NO THIRD PARTY SALES. SOUTH KOREA OUT. NO COMMERCIAL OR EDITORIAL SALES IN SOUTH KOREA.?
This picture taken on August 10, 2017 and released by North Korea's official Korean Central News Agency (KCNA) on August 11, 2017 shows service personnel of the Ministry of People's Security at a rally in support of North Korea's stance against the US, in Pyongyang. / AFP PHOTO / KCNA VIA KNS / STR / South Korea OUT / REPUBLIC OF KOREA OUT ---EDITORS NOTE--- RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT 'AFP PHOTO/KCNA VIA KNS' - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS THIS PICTURE WAS MADE AVAILABLE BY A THIRD PARTY. AFP CAN NOT INDEPENDENTLY VERIFY THE AUTHENTICITY, LOCATION, DATE AND CONTENT OF THIS IMAGE. THIS PHOTO IS DISTRIBUTED EXACTLY AS RECEIVED BY AFP. / (Photo credit should read STR/AFP/Getty Images)
A view shows a Pyongyang city mass rally held at Kim Il Sung Square on August 9, 2017, to fully support the statement of the Democratic People's Republic of Korea (DPRK) government in this photo released on August 10, 2017 by North Korea's Korean Central News Agency (KCNA) in Pyongyang. KCNA/via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THIS IMAGE. NO THIRD PARTY SALES. SOUTH KOREA OUT. NO COMMERCIAL OR EDITORIAL SALES IN SOUTH KOREA.?
This picture taken on August 10, 2017 and released by North Korea's official Korean Central News Agency (KCNA) on August 11, 2017 shows service personnel of the Ministry of People's Security at a rally in support of North Korea's stance against the US, in Pyongyang. / AFP PHOTO / KCNA VIA KNS / STR / South Korea OUT / REPUBLIC OF KOREA OUT ---EDITORS NOTE--- RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT 'AFP PHOTO/KCNA VIA KNS' - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS THIS PICTURE WAS MADE AVAILABLE BY A THIRD PARTY. AFP CAN NOT INDEPENDENTLY VERIFY THE AUTHENTICITY, LOCATION, DATE AND CONTENT OF THIS IMAGE. THIS PHOTO IS DISTRIBUTED EXACTLY AS RECEIVED BY AFP. / (Photo credit should read STR/AFP/Getty Images)
A general view shows a Pyongyang city mass rally held at Kim Il Sung Square on August 9, 2017, to fully support the statement of the Democratic People's Republic of Korea (DPRK) government in this photo released on August 10, 2017 by North Korea's Korean Central News Agency (KCNA) in Pyongyang. KCNA/via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THIS IMAGE. NO THIRD PARTY SALES. SOUTH KOREA OUT. NO COMMERCIAL OR EDITORIAL SALES IN SOUTH KOREA.??
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(Reporting by Michelle Nichols; Editing by James Dalgleish)

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