Obama visits Korea's DMZ

The president, who is in South Korea for a nuclear security summit, says he will attempt to enlist help from China in dealing with North Korea. With the death of Kim Jong Il, Obama says: 'The situation in North Korea is still very unsettled.'

The hard-to-predict and often-threatening plans of North Korea shadowed President Obama's nuclear security summit as soon as he arrived in Seoul, injecting a Cold War note to a meeting designed to deal with newer threats of terrorism and the spread of nuclear materials.

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