The J-11 is a Chinese fighter aircraft developed from the Russian Sukhoi Su-27. It is a twin-engine, all-weather air superiority fighter designed for various combat roles, including air-to-air and air-to-ground missions. The J-11 features advanced avionics and weapon systems, enhancing its capabilities in modern warfare. First introduced in the late 1990s, the J-11 has undergone several upgrades, leading to variants like the J-11B, which incorporates indigenous technology. The aircraft is primarily used by the People's Liberation Army Air Force (PLAAF) and plays a crucial role in China's military aviation strategy.