美国加强推动国际扩大对朝鲜的制裁

A senior U.S. diplomat says Washington is pushing hard for tough international sanctions against North Korea following its successful long-range rocket launch last month.

Wednesday, Assistant Secretary of State Kurt Campbell told reporters in Seoul that he anticipates formal steps by the United Nations Security Council in the immediate future.

Campbell, the top U.S. envoy to Asia, also warned North Korea against taking any more "provocative" steps, amid speculation that Pyongyang is preparing to conduct a nuclear test.