NKorea refuses to resume talks on nuclear program

"The six-party talks are over," Ri Hung Sik, spokesman for the North Korean delegation at a major Asian security conference, said Thursday.

North Korea's six-party negotiations — with the U.S., Russia, China, Japan and South Korea — ended last year after Pyongyang went back on a promise to halt its nuclear program, AP reported.

Clinton urged Asian nations Thursday to vigorously enforce the latest U.N. sanctions against North Korea. She said Washington would pursue "every avenue" to denuclearize the Korean peninsula.