As the U.S. Navy increases pressure on North Korea with a guided missile destroyer ... Lloyd Bucher, the commanding officer, had his teletype operator send a frantic message to forces in Japan ...

North Korean leader Kim Jong Un says past negotiations with the United States only confirmed Washington’s “unchangeable” ...

It has been named Hero Kim Kun Ok after a North Korean naval officer and historical figure ... He is quoted as saying that the sub will be one of the navy's main means of "underwater offensive." ...