...China's military projects offer a good example. China continues to import military technology, while it has made little progress in developing its own. As a result, China is currently in talks with Russia to purchase AL-31F aircraft engines. The engine is to be installed in Chinese J-11 fighter planes, a copy of the Russian Su-27 Flanker jet, and in the J-10 fighter, designed with Russian assistance on the basis of Israel's Lavi project of the 1980s.
The Chinese analogue of the AL-31F engine, the WS-10, has so far been unable to generate the required amount of power, despite years of hard work by Chinese engineers.
the new bacth of AL-31Fs will not be used for J-11s but for Su-27s and Su-30s in service ,since AL-31F has only a total life-span of 1500H and now they are getting close to the end of life span.
ITAR-TASS reported:
...Он уточнил, что речь идет о двигателях АЛ-31Ф для самолетов Су-27 и Су-30 и двигателях АЛ-31ФН для комплектации новых китайских истребителей J-10.