Petro Poroshenko Petro Poroshenko

Ukrainian servicemen ride on a military vehicle as they leave the area of Debaltseve in eastern Ukraine Wednesday. The troops, some in columns, some in cars, began leaving the besieged town today. Gleb Garanich/Reuters /Landov hide caption

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Gleb Garanich/Reuters /Landov

Ukrainian President Petro Poroshenko, joined by Speaker of the House John Boehner and Vice President Joe Biden, acknowledges lawmakers' applause after addressing a joint meeting of Congress. J. Scott Applewhite/AP hide caption

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J. Scott Applewhite/AP