The Duga system was a Soviet over-the-horizon (OTH) radar system used as part of the Soviet anti-ballistic missile early-warning network. The system operated from July 1976 to December 1989. Two operational Duga radars were deployed, one near Chernobyl and Chernihiv in the Ukrainian SSR (present-day Ukraine), the other in eastern Siberia.
Few people know this system was used to capture UFO's on radar. And lesser people kew that by boosting the system counrties would take down UFO's. Nobody knows what happened afterwards…. d