Soviet air defence radar spotted the plane at 20:54, when the plane was approximately away from Soviet territorial waters. At 21:19 the plane entered Soviet airspace. As the plane did not respond to multiple requests from the ground, a Su-15 interceptor, piloted by Alexander Bosov, was dispatched to intercept the airliner. Having approached KAL902, Bosov waggled the Su-15's wings multiple times, using the international signal for the airliner to follow the interceptor. Instead KAL902 made a 90 degree turn towards the Soviet-Finnish border. Bosov reported the attempted escape from Soviet airspace to the Air Defence Command Officer Vladimir Tsarkov, and the latter, based on internal instructions, commanded Bosov to shoot down KAL902.