The presence of three US aircraft carriers off the Korean Peninsula is pushing the region closer to nuclear war, according to a North Korean letter to the United Nations secretary-general, CNN reports.
The three carriers, the USS Ronald Reagan, USS Theodore Roosevelt and USS Nimitz, and their multi-ship strike groups are finishing up four days of exercises in the waters between South Korea and Japan on Tuesday.
It is the first time three of the 100,000-ton behemoths have sailed together in the Western Pacific together in a decade. They have been joined by several South Korean and Japanese warships during the exercise.
The exercises, which also have involved US B-1 bombers, are creating "the worst ever situation prevailing in and around the Korean Peninsula," North Korea's UN Ambassador Ja Song Nam said in a letter to the secretary-general on Monday.
Washington "is now running amok for war exercises by introducing nuclear war equipment in and around the Korean Peninsula, thereby proving that the US itself is the major offender of the escalation of tension and undermining of the peace," the letter read.
The exercises show North Korea is right to build up its defenses, the letter said.
During his trip, Trump struck a tough tone on North Korea, calling for an end to its nuclear program and saying "we hope to God we never have to use" the military strength the US has on the Korean Peninsula.
"This exercise in the Western Pacific is a strong testament to the US Pacific Fleet's unique ability and ironclad commitment to the continued security and stability of the region," Adm. Scott Swift, the commander of the US Pacific Fleet, said in a statement.
But Pyongyang has seen any US military exercises as a threat.
The state-run Korean Central News Agency said Saturday that the presence of the three carriers was part of Washington's "sinister intention to maintain military hegemony in the region."
KCNA also cited other recent US military moves, such as the first deployment of stealthy US Air Force F-35 fighters to Okinawa, as signs Washington is ramping up for war against North Korea.
Pyongyang also accused the US and its allies, including Japan, of trying to "escalate the military tension and increase arms race in the region with each passing day."
North Korean government officials told CNN's Will Ripley in Pyongyang last week that the US was increasingly taking action that could "ignite another Korean War."
"Nobody knows when and how the 'war maniac' Trump will ignite the 'wick of war,'" the officials said, referring to the presence of the carriers near the peninsula.
A South Korean Defense Ministry official said the three US carriers held drills on either side of the waters separating the Korean Peninsula and Japan. Exercises closest to the Korean coast involved US and South Korean ships, while those closest to Japan involved US and Japanese ships, the official said.