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

Fifth-Gen Fighter Jets Made for Ukraine War, Russia's Su-57 Is Missing

Russia avoids using its most modern fighter in Ukraine, says British intelligence - Aeroflap

Russia's top brass to get first Su-57 fifth-generation fighter in December - Military & Defense - TASS

38) US military releases footage of Russian fighter jet forcing down US drone over Black Sea

Russian aircraft firm masters production of Su-57s: Official

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

SU-57: Why Russia is not using its most advanced aircraft over Ukraine

Western Combat Aircraft Could Deter Russian Attacks, Report Says

Buddy To Su-57 Stealth Fighters, Russia Begins 'Hunting' Ukrainian Troops With S-70 Hunter Heavy-Attack Drones