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Obama
United States President Barack Obama speaks during the opening plenary session with U.S. Vice President Joseph Biden, right, and Hillary Clinton, U.S. secretary of state, during the Nuclear Security Summit at the Washington Convention Center in Washington, D.C., U.S., on Tuesday, April 13, 2010. Ukraine's agreement to relinquish its entire stockpile of highly enriched uranium gave Obama the first concrete result for a summit he convened on securing the world's atomic material..Credit: Andrew Harrer / Pool via CNP
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