Nuclear Security Summit
President Barack Obama meets with leaders from the international community to discuss ways to secure vulnerable nuclear material around the world, during the Nuclear Security Summit in Washington, D.C.
June 4, 2012
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May 30, 2012
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May 20, 2012
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May 2, 2012
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May 1, 2012
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April 16, 2012
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April 13, 2012
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April 11, 2012
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