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A South Korean soldier watches a TV screen reporting seismic waves of North Korea's nuclear test at Seoul train station in Seoul, South Korea, Tuesday, Feb. 12, 2013. Defying U.N. warnings, North Korea on Tuesday conducted an underground 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/Lee Jin-man)