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WARSAW, POLAND - JULY 09: Ukrania's President Petro Poroshenko (L) and NATO Secretary General Jens Stoltenberg (R) hold a press conference during the NATO Summit in Warsaw, Poland on July 09, 2016. (Photo by Dursun Aydemir/Anadolu Agency/Getty Images)

WARSAW, POLAND - JULY 09: Ukrania's President Petro Poroshenko (L) and NATO Secretary General Jens Stoltenberg (R) hold a press conference during the NATO Summit in Warsaw, Poland on July 09, 2016. (Photo by Dursun Aydemir/Anadolu Agency/Getty Images)