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FILE - In this Oct. 10, 2010 file photo, North Korean soldiers salute on tanks during a massive military parade marking the 65th anniversary of the communist nation's ruling Workers' Party in Pyongyang, North Korea. North Korea's newly minted leader Kim Jong Un presents the U.S. and its allies with an even more unknown character than his recently deceased father Kim Jong Il, and the strategic challenge of dealing with an inexperienced twenty-something who sits on a nuclear arms program, a stash of chemical weapons and the world's fourth-largest army. (AP Photo/Vincent Yu, File)