The Soviet Su-27 made debut to western world. The test pilot Viktor Pugachev demonstrated a maneuver called Cobra that would later be called “Cobra de Pugachev”. The Soviet Air Force began receiving Su-27s in June 1985. It officially entered service in August 1990. https://en.wikipedia.org/wiki/Sukhoi_Su-27 excerpt from World Aviation Video “Paris Air Show 89”