
Originally Posted by
Neo
When it comes to aerodynamics and designs Russia is much ahead of China but then again Chinese have far reaching contra intelligence all around the world including USA, no one knows how much intelligence they've gathered on stealth.
Here's an image of the J-XX, according to various sources China seems to have progressed with the project.

Neo,
Shealth is no magic bird which only the US has. The basic concept is about building the airframe able to not transmit back radar waves.
The effort is not about able to build it rather optimize the aircraft for stealth and also make them flyable. During the F-117 design LM had build a software which calculates the angle to deflect the radar waves for different part of the aircraft. One of the reason F-117 is so "rectangular".
The Chinese don't have to steal the aircraft to build a stealth. The majority of the effort is about testing the airframe for operation. Compare the time the Chinese have taken to test for IOC J-10 where they got the Lavi Design stock & barrel.
Personally I feel the Chinese still dont have the infrastructure for for that kind of effort.They will have within a decade of so,but not know. Specially around the avonics & EW systems.