Phazotron-NIIR

JSC Phazotron-NIIR (Phazotron-NIIR, Russian: ОАО «Корпорация «Фазотрон-НИИР») is Russia's largest developer of military radars and avionics. Named after one of its major projects, the first cosmotron in the former-USSR, it was formed in June 1917 to produce aviation instruments. Its main office is located in Moscow and it has 25 affiliated companies, branches and separate units in Moscow and other cities in Russia and Belarus. It employs an estimated 5000 employees. During the Soviet era, it was commonly known as the Scientific Research Institute of Radar, NII Radar or NIIR (Not to be confused with NII Radio, also NIIR).^[1]

JSC Phazotron-NIIR

Formerly	OKB-339
Company type	Joint Stock Company
Industry	Defense industry Aerospace industry
Founded	1917
Headquarters	Moscow , Russia
Products	Electronics, avionics, radars
Parent	Concern Radio-Electronic Technologies (Rostec)
Website	phazotron.com

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.