U.S. nuclear envoy on North Korea says swift, strong U.N. response needed

Kim added that the United States remains open to authentic, meaningful dialogue with the North on ending Pyongyang's pursuit of its nuclear program.

"Our intention is to secure the strongest possible (U.N. Security Council) resolution that includes new sanctions as quickly as possible," Kim told a news briefing after holding discussions with his South Korean counterpart.

(Reporting by Ju-min Park and James Pearson; Editing by Michael Perry)