PARIS, FRANCE - OCTOBER 02:  French President Francois Hollande welcomes German Chancellor Angela Merkel prior to their meeting at the Elysee Presidential Palace on October 02, 2015 in Paris, France. The leaders of France, Germany, Russia and Ukraine meet 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 Thierry Chesnot/Getty Images)