Why is Moscow buying three very similar jet fighters? – warisboring.com
With new radar the PAK FA fighter can detect any stealth aircraft: HERE
101KS-N navigation and targeting pod for Pak Fa
The 101KS-O infrared countermeasure system has sensors housed in turrets mounted on the dorsal spine and forward fuselage and uses laser-based countermeasures against heat-seeking missiles. The Atoll complex also includes the 101KS-U ultraviolet missile warning sensors and 101KS-N navigation and targeting pod.
T220 targeting pod for MiG
T220 targeting pod
On bmpd’s website, may 2014, they noted that the T220 targeting pod model was ordered by OAO NPK SPP (Joint Stock Company, “Scientific and Production Corporation Precision Instruments System” – «Научно-производственная корпорация «Системы прецизионного приборостроения») from a model company in Russia. They ordered a full-size demonstration pod which is intended to be carried on the MiG-29SMT, MiG-29M/M2 (MiG-35) and Su-35S. The pod is 2.4 meters long with a diameter of .37 meters. I couldn’t find any information on the T220 on NPK-SPP’s website; however that company also makes the OLS-35 and various other infrared/optics for aircraft, spacecraft, and navy ships. Source shokidriver.blogspot.com