Russia's F-15 Killer: Why America (and the World) Fears the Su-27

It was the USSR’s best plane—and it still packs one heck of a punch. 

Scary Stuff: Watch a Russian Su-27 Fighter and U.S. F-15 Get A Little Close

Origins- Evolution of the Su-27 into an F-15 killer (Part-2) – Defencyclopedia

How Russia's Su-57 Felon Jets Compare to U.S. F-35, F-22 Fighters

Su-27 was built on US F-15 Technology

McDonnell Douglas F-15 vs Sukhoi Su-27

Why did Sukhoi only make the Su-27 as a rival to the F-15? Is there a Sukhoi rival to the F-16? - Quora

Su-27 Flanker: The Story of Russia's F-15 Killer

Russian fighter pilots try to 'provoke' US jets into dogfights above Syria

5 Reasons Ukraine Should Get F-16 Jets

Russia Has Its Very Own F-15 Like Fighter Jet: Meet the Su-27

NATO jet approaches aircraft of Russian ambassador

US releases footage of Russian fighter jets 'harassing' US drones over Syria, US military

The combat statistics for all the aircraft currently in use