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. 

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

MQ-9 Reaper drone: What you need to know about the US-Russia spat

The saga of generations. Why Su-27 surpasses F-15

Has a Su-27 ever been shot down? - Quora

What Joint Russian-Syrian Air Patrols Might Mean For Foreign Air Forces Over Syria

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

Russian Su-27 performed safe but unprofessional intercept of U.S. Navy P-8 Poseidon, U.S. officials say - The Aviation Geek Club

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

Sukhoi Su-27 - Wikipedia

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

F-15 vs. Su-27

Foxy Flanker! How Russian Su-27 'Reaper Killer' Jet Outclassed USAF F-15 Fighter & Snatched Back Key World Records