OUISTREHAM, FRANCE - JUNE 06:  In this file photo German Chancellor Angela Merkel and Russian President Vladimir Putin attend commeoration ceremonies marking the 70th anniversary of the D-day invasion of Nazi-occupied Normandy on June 6, 2014 in Ouistreham, France. Merkel and other leaders of NATO-member states are attending a NATO summit in Newport, Wales, from September 4-5, 2014, and Russia's active involvement in the war in eastern Ukraine is high on the summit agenda. (Photo by Sean Gallup/Getty Images)