Dmitry Medvedev

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President Barack Obama, accompanied by Russian President Dmitry Medvedev, and others, waves as they leave Ray's Hell Burger in Arlington, Va., Thursday, June 24, 2010. (AP Photo/Charles Dharapak)

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President Barack Obama and Russia's President Dmitry Medvedev order burgers during an unscheduled visit to Ray's Hell Burger in Arlington, Va., Thursday, June 24, 2010. (AP Photo/Charles Dharapak)

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President Barack Obama and Russia's President Dmitry Medvedev eat burgers during an unscheduled visit to Ray's Hell Burger in Arlington, Va., Thursday, June 24, 2010. (AP Photo/Charles Dharapak)

President Barack Obama waits to be announced before a joint news conference with Russia's President Dmitry Medvedev, Thursday, June 24, 2010, in the East Room of the White House in Washington. (AP Photo/Pablo Martinez Monsivais)

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President Barack Obama and Russia's President Dmitry Medvedev arrive for their joint news conference in the East Room of the White House in Washington, Thursday, June 24, 2010. (AP Photo/J. Scott Applewhite)

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U.S. President Barack Obama and Russian President Dmitry Medvedev take a question from a Russian journalist in the East Room of the White House following their meeting in Washington on June 24, 2010. UPI/Roger L. Wollenberg

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President Barack Obama and Russia's President Dmitry Medvedev take part in a joint news conference in the East Room of the White House in Washington, Thursday, June 24, 2010. (AP Photo/J. Scott Applewhite)

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President Barack Obama and Russian President Dmitry Medvedev take part in a joint news conference in the East Room of the White House in Washington, Thursday, June 24, 2010. (AP Photo/Pablo Martinez Monsivais)

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U.S. President Barack Obama and Russian President Dmitry Medvedev depart after speaking to the media in the East Room of the White House following their meeting in Washington on June 24, 2010. UPI/Roger L. Wollenberg

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U.S. President Barack Obama (R) and Russian President Dmitry Medvedev walk from the North Portico of the White House on their way to the U.S. Chamber of Congress to discuss trade issues after their meeting in Washington on June 24, 2010. UPI/Roger L. Wollenberg

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U.S. President Barack Obama (R) and Russian President Dmitry Medvedev walk from the White House on their way to the U.S. Chamber of Congress to discuss trade issues after their meeting in Washington on June 24, 2010. UPI/Roger L. Wollenberg

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U.S. President Barack Obama (L) and Russian President Dmitry Medvedev walk through the North West Gate of the White House on their way to the U.S. Chamber of Congress to discuss trade issues after their meeting in Washington on June 24, 2010. UPI/Roger L. Wollenberg

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In this Wednesday, June 23, 2010, photo Russian President Dmitry Medvedev looks at an iPhone 4 with Apple Chairman and CEO Steve Jobs at Apple Inc. in Cupertino, Calif. Mr. Medvedev visited Silicon Valley as part of a U.S. tour that took him to Washington for meetings with President Obama on Thursday. (AP Photo/RIA-Novosti, Dmtiry Astakhov, Presidential Press Service)

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Russian President Dmitry Medvedev, left, and Russian gas monopoly Gazprom head, Alexei Miller, meet at the Gorki presidential residence outside Moscow, Monday, June 21, 2010. Mr. Medvedev ordered the state-controlled gas monopoly Monday to cut gas supplies to ex-Soviet neighbor Belarus over its debt for Russian natural gas supplies. On Thursday, June 24, 2010, Russia announced it will resume supply to Belarus. (AP Photo/RIA Novosti, Dmitry Astakhov, Presidential Press service)

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This photo provided by the White House shows President Barack Obama discussing the START treaty, during a phone call with Russian President Dmitry Medvedev, Friday, March 26, 2010, in the Oval Office of the White House in Washington. (AP Photo/Pete Souza, White House )

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ONE IN A CROWD: President Obama — with Recep Tayyip Erdogan of Turkey, Thailand's Prime Minister Abhisit Vejjajiva, Foreign Minister Prince Saud al-Faisal, Silvio Berlusconi of Italy, Hu Jintao of China and Dmitry Medvedev of Russia — backs global financial restructuring. (Getty Images)

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** FILE ** Russian President Dmitry Medvedev (right) acknowledges Prime Minister Vladimir Putin during the 2008 funeral of Russian Orthodox Patriarch Alexy II at the Christ the Savior Cathedral in Moscow. (Agence France-Presse/Getty Images)

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** FILE ** Vladimir Putin (left) and his handpicked successor, Dmitry Medvedev, greet supporters in Moscow's Red Square during a concert to mark the presidential election in March 2008. (AP Photo/RIA-Novosti, Vladimir Rodionov, Presidential Press Service)