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February 6, 2016

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President Barack Obama talks about the situation in Ukraine, Thursday, March 6, 2014, in the briefing room of the White House in Washington. The president said a referendum for Ukraine's Crimea region to separate and become part of Russia would violate international law.

Pablo Martinez Monsivais / AP

President Barack Obama talks about the situation in Ukraine, Thursday, March 6, 2014, in the briefing room of the White House in Washington. The president said a referendum for Ukraine's Crimea region to separate and become part of Russia would violate international law.