MIL OSI Translation. Region: Russian Federation – In the North-West of Russia, a large-scale special exercise was held with the calculations of the S-400 Triumph anti-aircraft missile systems (SAM), the duty shifts of the Kasta radar stations and the crews of the Su-35S multipurpose super-maneuverable fighters. The combat crews of the air defense missile systems, using electronic launches of anti-aircraft guided missiles, prevented the entry of fighter aircraft into the assigned airspace and the delivery of missile and bomb strikes against strategically important objects. The main task of the military personnel of the radio technical troops was the early detection of air targets approaching from different directions and at different heights, as well as the transmission of the coordinates of the trajectory of aircraft movement for anti-aircraft missile divisions.