BRUSSELS, BELGIUM - DECEMBER 02: NATO Secretary General Jens Stoltenberg (C) chairs the second day meeting of the NATO Foreign Ministers at the NATO headquarters in Brussels, Belgium on December 02, 2015. Montenegro's Deputy Prime Minister and Minister of Foreign Affairs and European Integration Igor Luksic (Center L) and Defense Minister Milica Pejanovic-Djurisic (Center L-2) attended the meeting. NATO foreign ministers on Wednesday invited Montenegro to become the 29th member of the alliance in its first expansion in six years. (Photo by Dursun Aydemir/Anadolu Agency/Getty Images)
