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Press conference of the President of Ukraine, Piotr Poroshenko, on the left, and the Secretary General of NATO, Jens Stoltenberg, on the right, in the NATO Warsaw Summit on July 9, 2016 in Warsaw, Poland (Photo by Celestino Arce/NurPhoto via Getty Images)

Press conference of the President of Ukraine, Piotr Poroshenko, on the left, and the Secretary General of NATO, Jens Stoltenberg, on the right, in the NATO Warsaw Summit on July 9, 2016 in Warsaw, Poland (Photo by Celestino Arce/NurPhoto via Getty Images)