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WARSAW, POLAND - JULY 09: NATO Secetary General Jens Stoltenberg speaks to the media at the Warsaw NATO Summit on July 9, 2016 in Warsaw, Poland. NATO member heads of state, foreign ministers and defense ministers are gathering for a two-day summit that will end later today. (Photo by Sean Gallup/Getty Images)

WARSAW, POLAND - JULY 09:  NATO Secetary General Jens Stoltenberg speaks to the media at the Warsaw NATO Summit on July 9, 2016 in Warsaw, Poland. NATO member heads of state, foreign ministers and defense ministers are gathering for a two-day summit that will end later today.  (Photo by Sean Gallup/Getty Images)