USS Carl Vinson is scheduled to arrive in Korean Peninsula ‘within days’.

North Korea said on Sunday it was ready to sink a U.S. aircraft carrier to demonstrate its military might, as two Japanese navy ships joined a U.S. carrier group for exercises in the western Pacific.

U.S. President Donald Trump ordered the USS Carl Vinson carrier strike group to sail to waters off the Korean peninsula in response to rising tension over the North’s nuclear and missile tests, and its threats to attack the United States and its Asian allies.

The U.S. has not specified where the carrier strike group is as it approaches the area. U.S. Vice-President Mike Pence said on Saturday it would arrive “within days” but gave no other details.

North Korea remained defiant. “Our revolutionary forces are combat-ready to sink a U.S. nuclear-powered aircraft carrier with a single strike,” the Rodong Sinmun, the newspaper of the North’s ruling Workers’ Party, said in a commentary.

The paper likened the aircraft carrier to a “gross animal” and said a strike on it would be “an actual example to show our military’s force”. The commentary was carried on page three of the newspaper, after a two-page feature about leader Kim Jong-un inspecting a pig farm.

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Speaking during a visit to Greece, Chinese Foreign Minister Wang Yi said there were already enough shows of force and confrontation at present and appealed for calm. “We need to issue peaceful and rational sounds,” Mr. Wang said, according to a statement issued by China’s Foreign Ministry.

American detained

Adding to the tensions, North Korea detained a Korean-American man in his fifties on Friday, bringing the total number of U.S. citizens held by Pyongyang to three.

The man, Tony Kim, had been in North Korea for a month teaching accounting at the Pyongyang University of Science and Technology (PUST), the institution’s chancellor Chan-Mo Park told Reuters. He was arrested at Pyongyang International Airport on his way out of the country.

U.S. and South Korean officials have been saying for weeks that the North could soon stage another nuclear test, something the United States, China and others have warned against.