The Sukhoi Su-27 entered People’s Liberation Army Air Force service in the early 1990s, as part of China’s effort to modernize its air combat capabilities with a high-performance, long-range air superiority fighter. Initially acquired through direct imports from Russia, the Su-27 was primarily deployed for air defense and fleet protection, operating from bases across China to secure national airspace. Over time, the aircraft became the foundation for Chinese derivatives such as the J-11 series, with domestic production, upgrades in avionics, radar, and weapon systems, and integration into multirole operations, including interception, strike, and pilot training. The Su-27 remains an important platform in the PLAAF, although more modern aircraft like the J-20 stealth fighter are gradually taking over frontline air superiority roles.