Duga 1

Duga (Russian: Дуга) was a Soviet over-the-horizon (OTH) radar system used as part of the Soviet ABM early-warning network. The system operated from July 1976 to December 1989. Two operational Duga radars were deployed, one near Chernobyl and Chernihiv in what was then called the Ukrainian SSR (present-day Ukraine), the other in eastern Siberia.
(Wikipedia.com)
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