From left: Kazakh President Nursultan Nazarbayev, Turkish Prime Minister Recep Tayyip Erdoğan and Ukrainian President Viktor Yanukovych before a working lunch hosted by U.S. President Barack Obama during the Nuclear Security Summit in Washington, April 13, 2010.

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German Chancellor Angela Merkel, left, and Ukrainian President Viktor Yanukovych before a working lunch hosted by U.S. President Barack Obama during the Nuclear Security Summit in Washington, April 13, 2010.

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Ukrainian President Viktor Yanukovych, center, and U.S. President Barack Obama before a working lunch hosted Obama during the Nuclear Security Summit in Washington, April 13, 2010.

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Ukrainian President Viktor Yanukovych, right, and U.S. President Barack Obama before a working lunch hosted Obama during the Nuclear Security Summit in Washington, April 13, 2010.

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