NATO's naval exercise Breeze 2016 with the participation of the Partnership for Peace states has begun in Bulgaria's territorial waters and international waters in the Black Sea.
As many as 25 military vessels, two aircraft and two helicopters, and 1700 troops of NATO countries will take part in the drill which will continue through to 17 July.
The participating states include Bulgaria, Greece, Romania, Turkey, and Spain, but the exercise is open to all NATO members.