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French President Francois Hollande (2nd L), German Chancellor Angela Merkel (2nd R) and German Foreign Minister Frank-Walter Steinmeier (R) laugh during the meeting of heads of state of the North Atlantic Council (NAC), at the NATO Summit in Warsaw, Poland, on July 8, 2016. The Polish capital Warsaw hosts a two-day top-level NATO meeting, for the first time since Poland joined the alliance in 1999. / AFP / WOJTEK RADWANSKI (Photo credit should read WOJTEK RADWANSKI/AFP/Getty Images)

French President Francois Hollande (2nd L), German Chancellor Angela Merkel (2nd R) and German Foreign Minister Frank-Walter Steinmeier (R) laugh during the meeting of heads of state of the North Atlantic Council (NAC), at the NATO Summit in Warsaw, Poland, on July 8, 2016.
The Polish capital Warsaw hosts a two-day top-level NATO meeting, for the first time since Poland joined the alliance in 1999. / AFP / WOJTEK RADWANSKI        (Photo credit should read WOJTEK RADWANSKI/AFP/Getty Images)