China has acquired Russian engines to the amount of $500 million - News - Russian Aviation - RUAVIATION.COM
AL-31FN engines are widely used on Chinese J-10 and J-11 fighters (the modified copy of Su-27). China acquires Russian engines regularly since the engines manufactured in China have low reliability. The Ministry of Defense has acquired 54 engines from Russia in 2003, 100 - in 2007 and 122 - in 2009. Supposedly, most of the acquired engines have been installed on export versions of Chinese fighters in accordance with requirements of the customers.
At present China manufactures WS-10 engines and its derivatives for J-10 and J-11.
These engines are copies of Russian AL-31, but they have lower thrust, reliability and time between overhaul. In particular, WS-10A engines are installed on Chinese J-15 deck-based fighter prototype (copy of Su-33), and WS-10G – on fifth-generation J-20 fighter bomber prototype.