South Korea

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South Korean astronomy students use telescopes to observe an annular solar eclipse in Seoul, South Korea, Monday, May 21, 2012. (AP Photo/Lee Jin-man)

A South Korean astronomy student uses special sunglasses to observe an annular solar eclipse in Seoul, South Korea. Millions of Asians watched as a rare "ring of fire" eclipse crossed their skies early Monday. (AP Photo/Lee Jin-man)

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South Korean President Lee Myung-bak (left), Chinese Premier Wen Jiabao (center) and Japanese Prime Minister Yoshihiko Noda pose for photographs ahead of the fifth trilateral summit among the three nations in Beijing on Sunday, May 13, 2012. (AP Photo/Petar Kujundzic, Pool)

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North Korean soldiers in Kim Il-sung Square in central Pyongyang, North Korea, chant during a rally denouncing South Korean President Lee Myung-bak on Friday, April 20, 2012. (AP Photo/Ng Han Guan)

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Japanese Foreign Minister Koichiro Gemba speaks at the sixth Trilateral Foreign Ministers Meeting, comprising Japan, China and South Korea, in the eastern Chinese city of Ningbo on Sunday, April 8, 2012. (AP Photo/Peter Parks, Pool)

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President Obama talks of reunification with North Korea during his visit to South Korea. President Lee Myung-bak is on hand. (Associated Press)

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President Obama (second from left) meets March 25, 2012, with members of the South Korean and U.S. militaries at Observation Post Ouellette in the Demilitarized Zone (DMZ), the tense military border between the two Koreas, in Panmunjom, South Korea. (Associated Press)

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U.S. President Barack Obama, left, laughs with Kazakhstan President Nursultan Nazarbayev, center, and Russian President Dmitry Medvedev during their joint statement at the Nuclear Security Summit at the Coex Center, in Seoul, South Korea, Tuesday, March 27, 2012. (AP Photo/Pablo Martinez Monsivais)

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President Obama waves after being greeted by South Korean President Lee Myung-bak at the Blue House, the official presidential house, in Seoul on Sunday, March 25, 2012. (AP Photo/Susan Walsh)

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U.S. President Barack Obama delivers a speech at Hankuk University in Seoul, South Korea, Monday, March 26, 2012. (AP Photo/Lee Jin-man)

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President Obama. with South Korean President Lee Myung-bak, is in Seoul with other world leaders to discuss measures to safeguard atomic facilities and materials. South Korean Foreign Minister Kim Sung-hwan said he hopes "concrete steps" will be taken during the summit, which opens Monday. (Associated Press)

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White House Senior Press Lead Jesse Lewin (left) and Press Lead Jeff Tiller (center) use their cellphones after the main entrance to the Blue House was blocked by South Korean security personnel during President Obama's visit with South Korean President Lee Myung-bak in Seoul on Sunday, March, 25, 2012. (AP Photo/Pablo Martinez Monsivais)

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President Obama and South Korean President Lee Myung-bak smile during a news conference at the Blue House, the official presidential house, in Seoul on Sunday, March 25, 2012. (AP Photo/Susan Walsh)

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**FILE** President Obama looks through binoculars toward North Korea from Observation Post Ouellette in the Demilitarized Zone, the tense military border between the two Koreas, in Panmunjom, South Korea, on March 25, 2012. With Mr. Obama is Lt. Col. Ed Taylor (right), commander of the U.N. Command Security Battalion-Joint Security Area. (Associated Press)

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President Barack Obama is greeted by Col. Patrick McKenzie, left, Commander, 51st Fighter, upon arrival at Osan Air Base to attend the Nuclear Security Summit, in Osan, south of Seoul, South Korea, Sunday, March 25, 2012. (AP Photo/Lee Jin-man)

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President Barack Obama boards Air Force One, for a flight to South Korea, at Andrews Air Force Base, Md., Saturday, March 24, 2012. (AP Photo/Cliff Owen)

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South Korean activists wearing masks of U.S. President Obama (center), South Korean President Lee Myung-bak (right) and the late South Korean President Roh Moo-hyun cheer to celebrate the free-trade agreement between South Korea and the United States during a rally near the U.S. Embassy in Seoul on Wednesday, March 14, 2012. (AP Photo/Lee Jin-man)

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A North Korean soldier operating a tank's gun turret Monday participates in a live-fire drill near country's disputed sea boundary with South Korea. The exercise came amid anger over from Pyongyang over U.S.-South Korean military drills. (Kyodo News via Associated Press)