President Obama is seen talking with Russian President Vladimir Putin, left, in 2012. More than 95% of Crimeans voted for the Ukrainian region's accession to Russia in a controversial referendum on March 16, according to preliminary results. The White House said that Obama told his Russian counterpart that the U.S. would not recognize the Crimean vote as it violated the Ukrainian constitution and that the US was "prepared to impose additional costs on Russia for its actions."
RiaNovosti / EPA
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