North Korea has complained to the United Nations about joint military exercises by the United State and South Korea, describing it as "the worst ever situation" because US nuclear war equipment had been deployed ready to strike.
In a letter to UN Secretary-General Antonio Guterres, seen by Reuters, North Korean UN 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 US 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 US carrier strike groups exercised together in the Western Pacific was in 2007.
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 UN Security Council of ignoring "the nuclear war exercises of the United States who is hell bent on bringing catastrophic disaster to humanity".
Ja asked Guterres to bring to the attention of the 15-member council - under the rarely used Article 99 of the UN Charter - "the danger being posed by the US 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.
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 UN Security Council has unanimously ratcheted up sanctions on North Korea over its nuclear and ballistic missile programs since 2006.
