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European Commission President Jean-Claude Juncker, right, and European Council President Donald Tusk, left, greet Ukrainian President Petro Poroshenko during arrivals at the Eastern Partnership summit in Riga, on Friday, May 22, 2015. EU leaders gather for a second day of meetings with six post-communist nations to discuss various issues, including enlargement, the economy and Ukraine. (AP Photo/Mindaugas Kulbis)

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