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PARIS, FRANCE - OCTOBER 02: Russian President Vladimir Putin (R) talks to German Chancellor Angela Merkel (L) during their meeting at the Normandy Format Summit on October 02, 2015 in Paris, France. The leaders of France, Germany, Russia and Ukraine are meeting in Paris to consolidate a fragile peace in Ukraine, as a conflict that appears to be winding down is overshadowed by President Vladimir Putin's dramatic intervention in Syria's war. (Photo by Sasha Mordovets/Getty Images)

PARIS, FRANCE - OCTOBER 02: Russian President Vladimir Putin (R) talks to German Chancellor Angela Merkel (L) during their meeting at the Normandy Format Summit on October 02, 2015 in Paris, France. The leaders of France, Germany, Russia and Ukraine are meeting in Paris to consolidate a fragile peace in Ukraine, as a conflict that appears to be winding down is overshadowed by President Vladimir Putin's dramatic intervention in Syria's war.  (Photo by Sasha Mordovets/Getty Images)