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Ukrainian President Petro Poroshenko (R) shakes hands with U.S. Senator John McCain during a meeting with Ukrainian servicemen in Shirokino settlement near Mariupol, Ukraine, December 31, 2016. Mikhail Palinchak/Ukrainian Presidential Press Service/Handout via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. EDITORIAL USE ONLY. - RTX2X1XS Handout / Reuters