I correct it.
117S TVC engine. In fact, China only want the TVC technology. Remember China does not have TVC technology at all. Spend 2 billion dollars, get the TVC tech plus 24 of Russia's best fighters (far superior to India's Su-30MKI). This is not a bad deal.
1. China will know just how good Su-30MKI is and how to deal with them and crush them in real combat, because Su-35 is superior in every way.
2. Gets TVC tech and then later put them on WS-10 and WS-15, or even WS-13 engines. This way. Pretty much all of Chinese fighters will have enhanced maneuverability. Remember, the TVC tech on Su-35 is top notch, it is 3D TVC even better than F-22's 2D TVC.