Su-27 was intercepted at the border with the Russian electronic intelligence aircraft EP-3E "Aries II" of the U.S. Navy, said the Ministry of defence. Around noon duty vehicles surveillance of the airspace found an unidentified aerial target over the neutral waters of the Black sea, moving towards Russian territory. Su-27 approached the aircraft at a safe distance, identify it and accompanied, preventing violations of the Russian border, told in the Ministry.