Russia's President Vladimir Putin signs a law on ratification of a treaty making Crimea part of Russia, during a ceremony in the Kremlin in Moscow on March 21, 2014. Putin said today Moscow would hold off on further reciprocal sanctions against the United States, after Washington introduced punitive measures against his close allies over the Ukraine crisis. AFP PHOTO/ POOL / SERGEI CHIRIKOV (Photo credit should read SERGEI CHIRIKOV/AFP/Getty Images)
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