North Korea's defence ministry said on Tuesday the United States is again posing a grave security threat by sending a nuclear submarine to a South Korean port and its military forces are ready to take any action necessary, says KCNA, APA reports.
The emergence of a U.S. nuclear submarine in the Korean peninsula is a "clear expression of the U.S. invariable hysteria for confrontation" against North Korea, an unnamed spokesperson for the North's defence ministry said in a statement.
"We express grave concern over the U.S. dangerous hostile military act that can lead the acute military confrontation in the region around the Korean peninsula to an actual armed force conflict," the statement carried by KCNA news agency said.
Its armed forces will "unhesitatingly exercise the legitimate right to punish the provokers," it said, without elaborating.
South Korea's defence ministry said USS Alexandria submarine entered the Busan port on Monday for supplies and rest for its crew and that it will be a chance for the two countries' navies to promote exchange and combined defence posture.
Its military said it had no comment on the North Korean statement.
The U.S. fast attack nuclear-powered submarine is part of the U.S. Pacific Fleet armed with Tomahawk cruise missiles, according to the U.S. navy.
North Korea routinely criticises the presence of U.S. military assets and joint drills by U.S. and South Korean forces. On Sunday, it warned of "undesirable consequences" criticising a series of exercises conducted by the allies.
The North's defence ministry spokesperson did not mention separate live-fire drills conducted jointly by South Korean and U.S. armies at a firing range south of the militarised Korean border since last week.
The North has stepped up aggressive rhetoric since Donald Trump took office last month for his second presidency despite his comments suggesting he would reach out to North Korean leader Kim Jong Un for direct dialogue.
