South Korea

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U.S. Secretary of State John Kerry (center) introduces South Korean President Park Geun-hye (left) to his senior staff members as they meet at the presidential Blue House in Seoul on April 12, 2013. (Associated Press)

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An unidentified elementary school teacher, center, orders her students to leave as they watch South Korean housewives stage a press conference denouncing the annual joint military exercise known as Foal Eagle, between South Korea and the United States, near the U.S. Embassy in Seoul, South Korea, Monday, April 8, 2013. (AP Photo/Ahn Young-joon)

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Soldiers from the U.S. Army's 23rd Chemical Battalion check their gear after a demonstration during a ceremony marking their return Thursday to the 2nd Infantry Division based at Camp Stanley in Uijeongbu, South Korea. Nearly 30,000 U.S. soldiers are stationed in South Korea.

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Soldiers of the U.S. Army 23rd chemical battalion wear gas masks while attending a demonstration of their equipment during a ceremony to recognize the battalion's official return to the 2nd Infantry Division based in South Korea at Camp Stanley in Uijeongbu, north of Seoul, Thursday, April 4, 2013. The 23rd chemical battalion left South Korea in 2004 and returned with some 350 soldiers in Jan. 2013. (AP Photo/Lee Jin-man)

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U.S. Secretary of State John Kerry speaks at a news conference with South Korean Foreign Minister Yun Byung-Se, not pictured, at the State Department in Washington, on Tuesday, April 2, 2013. (AP Photo/Jacquelyn Martin)

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The U.S. embassy in Seoul, South Korea, tweeted this picture of two F-22 Raptors on a recent training flight.

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South Korean soldiers patrol along a barbed-wire fence in Paju, South Korea, near the border village of Panmunjom, on Sunday, March 31, 2013. North Korea warned South Korea on Saturday that the Korean Peninsula had entered "a state of war" and threatened to shut down a border factory complex that's the last major symbol of inter-Korean cooperation. (AP Photo/Ahn Young-joon)