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KYIV, UKRAINE - AUGUST 24: President of Ukraine Petro Poroshenko during Independence Day. A Ukrainian Armed Forces military unit marches at Kyiv's Independence Square in Kyiv, Ukraine, 24 August 2016, during a parade on the occasion of the country's Independence Day celebrations. Ukrainians mark the 25th anniversary of Ukraine's independence from the Soviet Union in 1991. (Photo by Vitaliy Holovin/Corbis via Getty images)

KYIV, UKRAINE - AUGUST 24: President of Ukraine Petro Poroshenko during Independence Day. A Ukrainian Armed Forces military unit marches at Kyiv's Independence Square in Kyiv, Ukraine, 24 August 2016, during a parade on the occasion of the country's Independence Day celebrations. Ukrainians mark the 25th anniversary of Ukraine's independence from the Soviet Union in 1991. (Photo by Vitaliy Holovin/Corbis via Getty images)