Well initially China ordered some plane 'kits' and they were doing the assembly , and then they realized that wait , we can make our own flankers
So they used their own avionics, their own engines , I heard they are also conducting advance testing on engine and thrust related adavancements..
So the new J11 class J11B is really 100% Chinese
Every thing is Chinese made, there is no part that is Russian in the plane...
So that is why China is looking forward to export the planes to Pakistan with TOT
The planes China makes are 100% different then the ones that russia made in 70's , these are more advance planes new avionics and performance is superior
We expect to move ahead with J11B class by 2015 -
Russia may feel its the same plane but its not same plane , just like Levi is not F16 , and JF17 thunder is not Levi nor is the J10B F16 , they are inspired may be by earlier planes but these are unique planes Made in China
Example China's J11B fighters 100% made in China
Some old Russian plane , the plane from Kit
Russia may argue don't sell the kit planes , but China is not they have made their own plane J11 , and now they want to export J11B to its allies , with chinese engines , avionics and kits made in China