Istrebitel Sputnikov, or IS (Russian: Истребитель спутников, ИС, meaning "destroyer of satellites"[1]), was a Soviet anti-satellite weapons programme which led to the deployment of the IS-A or I2P system during the 1970s and 1980s.
[3] The first test flights of the IS spacecraft used the I1P configuration, and served to demonstrate the propulsion and control systems of the spacecraft.
[3] Following this, IS-A or I2P interceptors and IS-P or I2M targets were launched.
Only four IS-P targets were launched before the type was replaced by the cheaper DS-P1-M satellite,[5] launched as part of the Dnepropetrovsk Sputnik programme.
[6] In November 1968, 4 years after Polyot 1 and 2 were tested for a potential Satellite intercept, Kosmos 248 was successfully destroyed by Kosmos 252 which came within the 5km 'kill radius' and destroyed Kosmos 248 by detonating its warhead.