Fuming Kim Jong-un has denounced Western nations for deploying warships, planes and thousands of troops, fearing an atomic bomb could explode.
The North Korean dictator was expelled after the United States announced it would lead a Rim of the Pacific exercise at its doorstep near Hawaii and Southern California.
The war games, which will take place from June 29 to August 4, will include 26 nations, 38 warships, four submarines, nine national land forces, more than 170 aircraft and 25,000 troops.
Troops will “use a variety of capabilities and demonstrate the inherent resilience of the Navy”.
Both South Korea and Japan will take part in what the US Navy has branded as “the world’s largest international maritime exercise.”
But North Korea has slammed a US-led joint exercise, claiming it was destabilizing the West Korean peninsula and increasing the risk of military conflict.
Ri Myong-hak of North Korea’s Disarmament and Peace Organization said: “Due to the aggressive and hegemonic Indo-Pacific strategy of the United States, the region is under constant threat of military conflict.
“In turn, this has a negative impact on the Korean Peninsula.”
He denounced the United States for conducting “war games” in the Pacific more than 10 times this year, according to Yonhap News.
In a post on the State Department’s website, he said, “The world needs to know who is the real culprit and is aware of US military action.”
This year’s Rim of the Pacific is the 28th practice in the series, which began in 1971.
South Korea, the United States and Japan plan to conduct missile warning exercises and ballistic missile detection and tracking exercises near Hawaii in early August to counter North Korea’s advanced missile threats.
South Korea reportedly said the exercises could be conducted in the context of RIMPAC exercises – but would not comment on any specific date.
Defense Ministry spokesman Moon Hong-sik said: “North Korea’s nuclear and missile threat appears to be growing significantly in the security environment on the Korean Peninsula.
“So we have decided that it is time for all three countries to publicize the exercises we have conducted in response.”
This comes after Kim gave a cold signal to the West that it was ready to launch a nuclear attack at any moment.
The United States has promised a “quick response” with allies if Kim pushes for further nuclear tests.
South Korean Foreign Minister Park Geun-hye said North Korea was now preparing for a new nuclear exercise – and only a political decision by the regime could stop it.
On Sunday, according to the South Korean military, North Korea appeared to have artillery shells at sea – tested just days after Kim called for more defense capabilities to counter external threats.
Kim has fired more missiles so far this year than last, warning Seoul and Washington of the danger.
The long-range artillery deployed next to it poses a serious security threat to South Korea’s populous metropolitan area, just 25-30 miles from the northern border.
Earlier this month, North Korea fired eight ballistic missiles from multiple locations simultaneously as Kim boasted that it had “shaken the world” by conducting more missile tests.
Analysts have warned that Kim could speed up nuclear testing plans to divert the attention of the North Korean population from the devastating Kovid eruption.