Mattis and counterparts: North Korea poses a 'grave threat'

North Korea's weapons programs pose "an unprecedented and grave threat" to the United States, South Korea and Japan, defense ministers from the three countries warned Tuesday, according to a report by the AFP news agency.

U.S. Secretary of Defense James Mattis and his Asian counterparts vowed to step up diplomatic pressure on Pyongyang while enhancing military cooperation as they held security talks in the Philippines.