South Korea's Foreign Minister Kim Sung-hwan, right, arrives at United Nations headquarters for an emergency Security Council meeting on North Korea's nuclear test Tuesday, Feb. 12, 2013. Defying U.N. warnings, North Korea on Tuesday conducted its third nuclear test in the remote, snowy northeast, taking a crucial step toward its goal of building a bomb small enough to be fitted on a missile capable of striking the United States. (AP Photo/Craig Ruttle)

Associated Press
South Korea's Foreign Minister Kim Sung-hwan, right, arrives at United Nations headquarters for an emergency Security Council meeting on North Korea's nuclear test Tuesday, Feb. 12, 2013. Defying U.N. warnings, North Korea on Tuesday conducted its third nuclear test in the remote, snowy northeast, taking a crucial step toward its goal of building a bomb small enough to be fitted on a missile capable of striking the United States. (AP Photo/Craig Ruttle)
South Korea's Foreign Minister Kim Sung-hwan, right, arrives at United Nations headquarters for an emergency Security Council meeting on North Korea's nuclear test Tuesday, Feb. 12, 2013. Defying U.N. warnings, North Korea on Tuesday conducted its third nuclear test in the remote, snowy northeast, taking a crucial step toward its goal of building a bomb small enough to be fitted on a missile capable of striking the United States. (AP Photo/Craig Ruttle)
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