Besides the ground, the Russian early warning system has a space element. In Soviet and post-Soviet time it was represented by Oko spacecraft. Some of them were a part of the unified control system and since 1979 operated in a high elliptical orbit with the apogee considerably exceeding the perigee.
Read full news at this link...
 |
| The first EKS satellite took flight in 2015 (Picture source: Russian Ministry of Defense) |
