WARSAW, POLAND - JULY 08: (From L to R) NATO Secetary General Jens Stoltenberg, Lithuanian President Dalia Grybauskaite, German Chancellor Angela Merkel, French President Francois Hollande, Turkish President Recep Tayyip Erdogan and Albanian Prime Minister Edi Rama watch NATO military aircraft fly past during the Warsaw NATO Summit on July 8, 2016 in Warsaw, Poland. German-Turkish relations cooled markedly recently following the Bundestag's resolution to recognize the Armenian genocide. NATO member heads of state, foreign ministers and defense ministers are gathering for a two-day summit beginning today. (Photo by Sean Gallup/Getty Images)
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