Over-The-Horizon [OTH] radars
Three operational over-the-horizon radars for ballistic missile detection could provide additional long-range warning of the approach of high-flying aircraft. An over-the-horizon radar under construction in the Far East in the mid-1980s would provide long-range detection of aircraft from the Pacific Ocean.
Sources and Resources
http://www.fas.org/nuke/guide/russia/airdef/oth.htm
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Updated Friday, July 03, 1998 8:13:07 AM