The Sukhoi Su-57 completed combat operations over Ukraine

The Russian Air Force has reportedly used four of its new Sukhoi Su-57, fifth-generation fighter jets, to carry out attacks against Ukrainian air defense system

Ukraine-Russia War: Ukrainian Forces Shoot Down Three Russian Fighter Jets - WSJ

Sukhoi Su-57 - Smartencyclopedia

Sukhoi Su-57 – A significant boost to Russian air combat capabilities

Russia May Develop Naval Variant of Su-57 Fighter: Report

Russia Completes Latest Su-57 Felon Stealth Fighter Deliveries, NATO Probably Indifferent - autoevolution

Is Russia's New Su-57 Stealth Fighter Going to War in Ukraine? - 19FortyFive

2022 Military Aviation News

Su-57 in Focus: 'Felon' on the Loose!

Putin's comments underline growing Russian concern over jet, tank production - Breaking Defense

Sukhoi Su-57 - Wikipedia