US President vows defence of South Korea

US President Barack Obama has spoken to South Korean President Lee Myung-bak about North Korea's nuclear test and agreed to work with the UN Security Council to address it.

They agreed to work closely together, including at the United Nations Security Council, to seek a range of measures aimed at impeding North Korea's nuclear and ballistic missile programs and reducing the risk of proliferation.

President Obama unequivocally reaffirmed that the United States remains steadfast in its defense commitments to the Republic of Korea, including the extended deterrence offered by the US nuclear umbrella.

– White House statement

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Nuclear test sanction threat

The United Nations says it "strongly condemns" North Korea's nuclear test. The United States is calling for an increase in sanctions against the communist state.