The impoverished country may be using its nuclear programme as a bargaining tool to obtain aid and ease sanctions.

这个贫穷的国家可能把它的核计划作为谈判的工具来得到援助和解除制裁。

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The US Treasury Secretary, Timothy Geithner, who appeared with Mrs Clinton at the news conference, warned that international banks should be wary of doing any business with Iran that might aid its nuclear programme.

BBC: Iran faces fresh Western sanctions over nuclear plans

Although Pyongyang has given up parts of its nuclear programme in return for aid, it has continued to develop missiles and enrich nuclear material.

BBC: North Korea tells South to leave islands

None of the others around the negotiating table knows Mr Kim's intentions: will he eventually agree to a tougher, more verifiable version of the 1994 deal, in which he dismantles his nuclear programme in return for international aid?

ECONOMIST: Jaw-jaw beats nuclear war | The