(From L to R) European Council President Donald Tusk, US President Barack Obama and European Commission President Jean-Claude Juncker arrive at a press conference for the joint press statements followig a meeting on the sidelines of the NATO Summit at a hotel in Warsaw on July 8, 2016. The Polish capital hosts a two-day NATO summit, first time that it hosts a top-level meeting of the Western military alliance since it joined in 1999. / AFP / Mandel Ngan (Photo credit should read MANDEL NGAN/AFP/Getty Images)