JSCPhazotron-NIIR (Phazotron-NIIR,Russian:ОАО «Корпорация «Фазотрон-НИИР») isRussia's largest developer of militaryradars andavionics. Named after one of its major projects, the firstcosmotron in the former-USSR, it was formed in June 1917 to produce aviation instruments. Its main office is located inMoscow and it has 25 affiliated companies, branches and separate units in Moscow and other cities in Russia andBelarus. It employs an estimated 5000 employees. During the Soviet era, it was commonly known as theScientific Research Institute ofRadar,NII Radar orNIIR (Not to be confused with NII Radio, alsoNIIR).^[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 wasAdolf Tolkachev, who became an American spy and over the years between 1979 and 1985, supplied a great deal of information about such projectsR-23,R-24,R-33,R-27, andR-60,S-300, as well as about fighter-interceptor aircraft radars used onMiG-29,MiG-31, andSu-27 and other avionics directly to theCIA.

The main competitor of Phazotron in the formerSoviet Union andRussia is theTikhomirov 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. Phazotron also builds radars for space vehicles. In addition to its military products, Phazotron also develops weather radars and civil products.

• N010 Zhuk Airborne Radar.
• N007 Zaslon Airborne Radar.

• Tikhomirov Scientific Research Institute of Instrument Design
• Vega Radio Engineering Corporation
• Aviadvigatel

• Official website