North Korea said on Sunday it was ready to sink a U.S. aircraft carrier to demonstrate its military might, in the latest sign of rising tension as U.S. President Donald Trump prepared to call the leaders of China and Japan.

The United States ordered the USS Carl Vinson carrier strike group to sail to waters off the Korean peninsula in response to mounting concern over the North’s nuclear and missile tests, and its threats to attack the United States and its Asian allies.

The U.S. government 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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