BBC correspondent Lucy Williamson on North Korea's nuclear programme
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North Korea ramps up nuclear rhetoric as UN vote looms

7 March 2013 Last updated at 12:26 GMT

North Korea has ramped up rhetoric ahead of a UN vote on sanctions in response to its nuclear test.

Accusing the US of pushing to start a war, it vowed to exercise its right to launch a pre-emptive nuclear attack against its aggressors.

The Security Council meets later today to approve fresh sanctions against Pyongyang over the 12 February test.

The BBC's Lucy Williamson in Seoul says it is not clear how advanced North Korea's nuclear programme is.