The PAK FA (an acronym for Perspektivny Aviatsionny Kompleks Frontovoy Aviatsii, or Prospective Aeronautical Complex of Frontline Air Force) was the Russian military program launched in the early 2000s to develop a fifth-generation stealth fighter. Designed to replace the aging Su-27 “Flanker” and MiG-29 “Fulcrum” fleets, the PAK FA was intended to be Russia’s technological peer to the American F-22 Raptor. The project, led by the Sukhoi Design BureauSukhoi – A prominent Russian aerospace and defense corporation specializing in the design and manufacture of military aircraft, particularly fighter a... More under the internal designation T-50, focused on combining low-observable (stealth) technology with supermaneuverability, supercruise, and advanced sensor fusion. The program successfully culminated in the SukhoiSukhoi – A prominent Russian aerospace and defense corporation specializing in the design and manufacture of military aircraft, particularly fighter a... More Su-57 (NATONATO (North Atlantic Treaty Organization) – A collective defense alliance established by the North Atlantic Treaty signed on April 4, 1949, initially ... More reporting name “Felon”), which became the first aircraft in the Russian inventory to utilize stealth as a core design principle, effectively superseding earlier experimental concepts like the MiG 1.44.