China believes it will be free from dependence on Russia for military jet engines within the next 5-10 years. Currently, China imports two Russian engines, the $3.5 million AL-31 (for the Su-27/30, J-11, J-10) and the $2.5 million RD-93 (a version of the MiG-29s RD-33) for the JF-17 (a F-16 type aircraft developed in cooperation with Pakistan.)
Meanwhile, Chinese engineers have managed to master the manufacturing techniques needed to make a Chinese copy of the Russian AL31F engine. This Chinese copy, the WS10A, part of a program that has also developed the WS-13, to replace the RD-93. China has long copied foreign technology, not always successfully. But in the last decade, China has poured much money into developing a jet engine manufacturing capability. The Chinese encountered many of the same problems as the Russians did when developing their own engine design and construction skills. But China has several advantages. First, they knew of the mistakes the Russians had made, and so were able to avoid many of them. Then there was the fact that China had better access to Western manufacturing technology (both legally and illegally). Finally, China was, unlike the Soviets, able to develop their engine manufacturing capabilities in a market economy. This was much more efficient than the command economy that the Soviets were saddled with for seven decades.