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MOSCOW, RUSSIA - JUNE 25: Russian President Vladimir Putin (C) and Defence Minister Sergei Shoigu (R) toast during reception for graduated of military academies in the Grand Kremlin Palace on June 25, 2015 in Moscow, Russia. Russian President Vladimir Putin is not done in eastern Ukraine, NATO's top commander said on Thursday, cautioning that Russia has been building up supplies on its border with Ukraine and keeping its military options open. U.S. General Philip Breedlove, NATO's supreme allied commander, said the border between Ukraine and Russia was 'wide open,' allowing free movement of equipment and supplies. (Photo by Sasha Mordovets/Getty Images)

MOSCOW, RUSSIA - JUNE 25: Russian President Vladimir Putin (C) and Defence Minister Sergei Shoigu (R) toast during reception for graduated of military academies in the Grand Kremlin Palace on June 25, 2015 in Moscow, Russia. Russian President Vladimir Putin is not done in eastern Ukraine, NATO's top commander said on Thursday, cautioning that Russia has been building up supplies on its border with Ukraine and keeping its military options open. U.S. General Philip Breedlove, NATO's supreme allied commander, said the border between Ukraine and Russia was 'wide open,' allowing free movement of equipment and supplies. (Photo by Sasha Mordovets/Getty Images)