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On February 12,2013,North Korea announced it had successfully conducted its third underground nuclear test.After such a dangerous move,the U.S.and South Korea tightened their bilateral security cooperation and beefed up defense measures.This caused tensions to escalate on the Korean Peninsula,and the situation appeared to spin out of control.The crisis pushed China and the U.S.together to work on this issue.This article will analyze those deep-seated factors affecting bilateral cooperation and make an initial exploration of its prospects while providing an overview of their joint actions to solve the North Korean nuclear issue.