US Admiral Mike Mullen meeting with Chinese officials
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US commanders urge China to use influence on North Korea

China has a "unique responsibility" to tackle the issue of North Korea, a top US military commander has said.

Admiral Mike Mullen said Beijing had influence over Pyongyang which it should use to curb its behaviour.

His comments came after talks with senior officials in the wake of last month's deadly shelling of a South Korean island.

Lucy Williamson reports from Seoul.

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