Russia has reacted angrily to NATO's membership invitation to Montenegro, which was made formally on May 19. The Kremlin said the Western military alliance's further expansion was a "negative process".
Euronews: ‘We don’t want a Cold War’, NATO tells Russia (VIDEO)
(LtoR) British Foreign Affairs Secretary Philip Hammond talks with NATO Secretary General Jens Stoltenberg during a foreign affairs ministers meeting at the NATO headquarters in Brussels on May 19, 2016.
