Russian President Dmitry Medvedev, left, and President of Ukraine Viktor Yanukovych, right, at a news conference on Russia and Ukraine talks, at Kharkov regional administration office.

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President of Ukraine Viktor Yanukovych, center, at a meeting of Russia and Ukraine's heads of states with the officials of Russian and Ukrainian border regions, at Kharkov regional administration office.

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April 21, 2010. Russian President Dmitry Medvedev, front center, and President of Ukraine Viktor Yanukovych, background center, before signing the documents after Russian-Ukrainian talks. From left: Alexei Miller, Gazprom Chairman of the Management Committee, Sergei Naryshkin, head of Kremlin administration, and Anaroly Serdyukov, Russian Defense Minister.

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April 21, 2010. Russian President Dmitry Medvedev, second left, and President of Ukraine Viktor Yanukovych, second right, walking around Kharkov.

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April 21, 2010. Russian President Dmitry Medvedev, left, and President of Ukraine Viktor Yanukovych, right, walking around Kharkov.

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April 21, 2010. Russian President Dmitry Medvedev, center, and President of Ukraine Viktor Yanukovych, second right, walking around Kharkov.

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April 21, 2010. Russian President Dmitry Medvedev, center, and President of Ukraine Viktor Yanukovych, right, walking around Kharkov.

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April 21, 2010. Russian President Dmitry Medvedev, background left, and President of Ukraine Viktor Yanukovych, background right, during the signing of the agreement between Gazprom chief Alexei Miller, front left, and Naftogaz of Ukraine chief Yevhen Bakulin, front right, on Russian gas supplies to Ukraine and gas transit to Europe in 2009-2019.

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April 21, 2010. Russian President Dmitry Medvedev, background left, and President of Ukraine Viktor Yanukovych, background right, during the signing of the agreement between Gazprom chief Alexei Miller, front left, and Naftogaz of Ukraine chief Yevhen Bakulin, front right, on Russian gas supplies to Ukraine and gas transit to Europe in 2009-2019.

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April 21, 2010. Russian President Dmitry Medvedev, left, and President of Ukraine Viktor Yanukovych, right, walking around Kharkov.

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April 21, 2010. Russian President Dmitry Medvedev, left, and President of Ukraine Viktor Yanukovych, right, at a news conference on Russia and Ukraine talks, at Kharkov regional administration office.

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April 21, 2010. Russian President Dmitry Medvedev, left, and President of Ukraine Viktor Yanukovych, right, at a news conference on Russia and Ukraine talks, at Kharkov regional administration office.

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April 21, 2010. Russian President Dmitry Medvedev, left, and President of Ukraine Viktor Yanukovych, right, at a news conference on Russia and Ukraine talks, at Kharkov regional administration office.

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April 21, 2010. Russian President Dmitry Medvedev, left, and President of Ukraine Viktor Yanukovych, right, at a news conference on Russia and Ukraine talks, at Kharkov regional administration office.

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April 21, 2010. Russian President Dmitry Medvedev, left, and President of Ukraine Viktor Yanukovych, right, at a news conference on Russia and Ukraine talks, at Kharkov regional administration office.

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April 21, 2010. Russian President Dmitry Medvedev, left, and President of Ukraine Viktor Yanukovych, right, sign an extension agreement on Russian Black Sea Fleet presence in Crimea after 2017.

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April 21, 2010. Russian President Dmitry Medvedev, left, and President of Ukraine Viktor Yanukovych, right, sign an extension agreement on Russian Black Sea Fleet presence in Crimea after 2017.

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April 21, 2010. Russian President Dmitry Medvedev, left, and President of Ukraine Viktor Yanukovych, right, sign an extension agreement on Russian Black Sea Fleet presence in Crimea after 2017.

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April 21, 2010. Russian President Dmitry Medvedev, left, and President of Ukraine Viktor Yanukovych, right, sign an extension agreement on Russian Black Sea Fleet presence in Crimea after 2017.

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April 21, 2010. President of Ukraine Viktor Yanukovych (third right) at a meeting of Russia and Ukraine's heads of states with the officials of Russian and Ukrainian border regions, at Kharkov regional administration office.

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April 21, 2010. Russian President Dmitry Medvedev (sixth left) and President of Ukraine Viktor Yanukovych (fifth right) at a meeting with the officials of Russian and Ukrainian border regions, at Kharkov regional administration office.

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April 21, 2010. From left: Alexander Rumyantsev, head of the Federal Agency for Nuclear Power, Alexei Gordeev, governor of the Voronezh Region, and Alexei Miller, Gazprom Chairman of the Management Committee, at a meeting of Russia and Ukraine's heads of states with the officials of Russian and Ukrainian border regions, at Kharkov regional administration office.

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April 21, 2010. Russian President Dmitry Medvedev, left, at a meeting of Russia and Ukraine's heads of states with the officials of Russian and Ukrainian border regions, at Kharkov regional administration office. Right: Russian Foreign Minister Sergei Lavrov.

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April 21, 2010. Russian President Dmitry Medvedev (background second left) and President of Ukraine Viktor Yanukovych (front, fourth left) at a meeting with the officials of Russian and Ukrainian border regions, at Kharkov regional administration office.

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April 21, 2010. Russian President Dmitry Medvedev, left, meets with President of Ukraine, right, at Kharkov regional administration office.

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April 21, 2010. Russian President Dmitry Medvedev, left, meets with President of Ukraine, right, at Kharkov regional administration office.

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April 21, 2010. Russian President Dmitry Medvedev, left, meets with President of Ukraine, right, at Kharkov regional administration office.

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April 21, 2010. From left: Russian President Dmitry Medvedev during a meeting with Ukrainian President Viktor Yanukovych at the Kharkov Regional Administration.

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April 21, 2010. From left: Russian President Dmitry Medvedev during a meeting with Ukrainian President Viktor Yanukovych at the Kharkov Regional Administration.

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April 21, 2010. Russian President Dmitry Medvedev, right, being greeted at Kharkov's airport.

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April 21, 2010. Russian President Dmitry Medvedev, foreground center, being greeted at Kharkov's airport.

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April 21, 2010. Russian President Dmitry Medvedev being greeted at Kharkov's airport.

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