Duga 1, Chernobyl

Duga (Russian: Дуга) 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.