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MINSK, BELARUS - FEBRUARY 11: Ukrainian President Petro Poroshenko attends the the summit held for the situation in Ukraine with the participation of Russian President Vladimir Putin, German Chancellor Angela Merkel, and French President Francois Hollande at the Independence Palace in Minsk, Belarus on February 11, 2015. (Photo by Sefa Karacan/Anadolu Agency/Getty Images)

MINSK, BELARUS - FEBRUARY 11: Ukrainian President Petro Poroshenko attends the the summit held for the situation in Ukraine with the participation of Russian President Vladimir Putin, German Chancellor Angela Merkel, and French President Francois Hollande at the Independence Palace in Minsk, Belarus on February 11, 2015. (Photo by Sefa Karacan/Anadolu Agency/Getty Images)