Russia's President Vladimir Putin (R) and Ukrainian President Viktor Yanukovych shake hands after signing documents during their meeting in the Kremlin in Moscow, on December 17, 2013. Putin said that the state energy companies of Russia and Ukraine had signed an amended agreement slashing the price Moscow charges its cash-strapped neighbour for natural gas. AFP PHOTO / ALEXANDER NEMENOV (Photo credit should read ALEXANDER NEMENOV/AFP/Getty Images)
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