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Montenegro's Prime Minister Milo Djukanovic (R) shakes hands with NATO Secretary General Jens Stoltenberg after a joint press conference on October 15, 2015 in Podgorica. Montenegro's leader expressed optimism that his country would join NATO by the end of the year, after the Alliance's Secretary General commended Podgorica for its reform path. Following the two-day visit of Jens Stoltenberg and the North Atlantic Council, Milo Djukanovic said he was 'full of optimism... that Montenegro hopefully will be invited to join NATO as early as in December.' AFP PHOTO / SAVO PRELEVIC (Photo credit should read SAVO PRELEVIC/AFP/Getty Images)

Montenegro's Prime Minister Milo Djukanovic (R) shakes hands with NATO Secretary General Jens Stoltenberg after a joint press conference on October 15, 2015 in Podgorica. Montenegro's leader expressed optimism that his country would join NATO by the end of the year, after the Alliance's Secretary General commended Podgorica for its reform path. Following the two-day visit of Jens Stoltenberg and the North Atlantic Council, Milo Djukanovic said he was 'full of optimism... that Montenegro hopefully will be invited to join NATO as early as in December.'  AFP PHOTO / SAVO PRELEVIC        (Photo credit should read SAVO PRELEVIC/AFP/Getty Images)