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Tension on the Korean peninsula has been rising since the sinking of a South Korean coastal warship in late March. An international investigation concluded the Cheonan was hit by a North Korean torpedo. Pyongyang denies any involvement and says any moves by the United Nations to punish it for the act could lead to war.

World leaders at a G8 meeting Saturday in Canada criticized North Korea over the sinking and its nuclear program.

North Korea on Monday announced it would have to increase its nuclear weapons capability, blaming unspecified threats by the United States' military. This comes following criticism of North Korea at two summits in Canada,

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