Russia may develop the Super Flanker fighter from 2027 - Air

According to reports, Sukhoi may merge production of the Su-30 and Su-35 into a new, lower-cost re-powered fighter called Super Flanker

Su-30SM2 “Super Sukhoi” Multipurpose fighter - RedStar

Why do Sukhoi's Su-35s have vertical tails instead of the horizontal tails seen on most Russian jets including the Su-27 family and MiG family (with few exceptions)? - Quora

Sukhoi Su-27 (Flanker)

Sukhoi Su-57 / T-50 / PAK FA - flight testing and development Part II [2012-current], Page 48

Indonesia Officially Turned Down Russia's Offer to Buy Su-35 – Global Defense Corp

Experts break down why the Russian air force might be hiding

Challenger To F-15 Eagle, Russian Su-27 Fighter With 'Murky Past' Finds Its Way Into USAF's National Museum

Aerospace Analysis & Insight

The Russian Jet That Fights for Both Sides, Air & Space Magazine

Canadian fighter jets intercept Russian military aircraft over Black Sea

The Russian Jet That Fights for Both Sides, Air & Space Magazine

Russia has not used Su-57 and Su-75 super-planes in the war against Ukraine : r/ukraine

Russia Limiting Its Advanced Combat Jets to Russian Airspace: UK Intel

Su-27 Flanker Front-Line Fighter Aircraft, Russia - Airforce Technology