In this photo taken Wednesday, March 15, 2017, Montenegrin army helicopters stand on the tarmac at Golubovci airport, near Podgorica, Montenegro. Despite the Russian anger and a deep split within the nation of some 620,000 people over the issue, Montenegro is formally becoming the 29th member of the Western military alliance at a ceremony in Washington on Monday. (AP Photo/Darko Vojinovic)
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