 One of its former chief designers was Adolf Tolkachev, who became an American spy and over the years between 1979 and 1985, supplied a great deal of information about such projects R-23, R-24, R-33, R-27, and R-60, S-300, as well as about fighter-interceptor aircraft radars used on MiG-29, MiG-31, and Su-27 and other avionics directly to the CIA.The main competitor of Phazotron in the former Soviet Union and Russia is the Tikhomirov Scientific Research Institute of Instrument Design, or NIIP, and both design houses were briefly joined but then separated again.Phazotron builds radars and radar weapon and defense control systems for aircraft, gun-missile ground-based and ship-borne air defense systems.