China’s Air Force: from Shield to Sword

... were in a rush, because the Chinese WS-10 engine was not ready for front-line use on account of its inadequate time between overhauls, and Russia had refused for some time to supply engines in sufficient quantity to equip the “counterfeit” fighters. However, China later managed to slightly improve the quality of its engines and overcome the conflict situation with Russia, and at least the Su-27 copies are now fitted with Chinese-made engines. A version of the J-10 with a WS-10 engine is undergoing trials,...