A Greek warship has collided with a Turkish ship in the Aegean Sea, Greece said on Friday. The incident was the latest in a series of terse encounters between the regional rivals and the NATO allies. The Turkish merchantman ship “approached and touched” one of the Greek Navy’s gunboats, which was taking part in a NATO exercise, AFP said. After the collision the merchantman fled back towards Turkish waters, according to the military. Turkey has for decades disputed Greek sovereignty over Aegean waters and airspace close to Turkish shores, which Athens says is based on postwar treaties.