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US aircraft carrier leads drills with South Korea (AP)

A U.S. Navy helicopter flies over the Nimitz-class USS George Washington for joint military exercises between the U.S. and South Korea, at the Busan port in Busan, south of Seoul, South Korea, Sunday, July 25, 2010. The massive nuclear-powered U.S. supercarrier began maneuvers Sunday with ally South Korea in a potent show of force that North Korea has threatened could lead to 'sacred war.' (AP Photo/ Lee Jin-man)AP - A nuclear-powered U.S. supercarrier led an armada of warships in exercises off the Korean peninsula Sunday that North Korea has vowed to physically block and says could escalate into nuclear war.