Vitali Klitschko

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Using his might: "If Ukraine will be alone in this fight, it will be a tragedy for all our countries," said Vitali Klitschko, who is pressuring the U.S. and the European Union to help his country keep Western influence. (Associated Press)

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Ukrainian presidential candidate Petro Poroshenko, left, and Vitali Klitschko, pause, during a press conference, in Kiev, Ukraine, Monday, May 26, 2014. (AP Photo/Efrem Lukatsky)

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Ukraine's MP Vitali Klitschko, leader of the UDAR (Ukrainian Democratic Alliance for Reform) party, centre right, greets a protester outside 10 Downing Street in London after a meeting with British Prime Minister David Cameron and Foreign Secretary William Hague, Wednesday, March 26, 2014. (AP Photo/Sang Tan)