Development of the original aircraft-based ASAT system, known as Kontakt, was approved almost 30 years ago, in November 1984 (as a direct response to the U.S. system that was first tested in 1984). The ground-based component was supposed to include the radio-optical Krona (45Zh6) complex as well as a command complex. The interceptor was carried by a modified MiG-31D aircraft (MilitaryRussia.ru has good photos of the radar and the aircraft). A three-stage interceptor was designed to hit targets at altitudes of 120-600 km (and up to 1500 km after the second stage of the project was completed). The system was supposed to attack up to 24 satellites within a 36-hour period (documents also mention 20-40 satellites in 24 hours).