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Obama's warning to North Korea

Barack Obama has warned North Korea about its nuclear ambitions, stating there would be "no rewards for provocation" and urging them to "have the courage to pursue peace" in a speech in Seoul in South Korea.

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South Korea to host nuclear security summit

President Barack Obama looks through binoculars across at the North Korea border Credit: AP Photo/Pablo Martinez Monsivais

South Korea will host some 50 world leaders at a two-day nuclear security summit starting on Monday to discuss ways to safeguard nuclear materials and facilities from terrorist groups.

It is the second such summit - the first was hosted by U.S. President Barack Obama in Washington in 2010.

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