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Obama
Luiz Inacio Lula da Silva, Brazil's president, stands for a moment in silence for recently deceased Polish President Lech Kaczynski 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 U.S. President Barack 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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