美国寄望中国约束朝鲜（在线收听）

 　　But first, can China pull North Korea back from the brink? The North's ruling Worker's Party newspaper said today that the outbreak of nuclear war had now become a fait accompli, owing to the US and the South Korean puppet forces. It's more of a bombastic rhetoric coming out of Pyongyang in recent weeks, but accompanied as well by the movement of missile launchers. US Secretary of State John Kerry is in Beijing, urging China to restrain its troublesome neighbour and ally. In a moment, we'll hear from my colleague Dan Damon in the South Korean capital Seoul. But first, will China heed Mr Kerry's call for a tougher line? The BBC's Julian Marshall has been talking to Professor Wang Dong of Peking University.