Can you give me an example?
No of course not. You can't expect such examples to be out in the open surely!
Bottom line is, China will not sell anything cutting edge to any country and risk its capabilities getting exposed. This is the one of the strongest points of Chinese weapon systems, they are relatively unknown and enemies have to keep guessing just how capable Chinese weapons are.
Your country would prefer to keep this advantage. This is also the reason why China always has a second line of weapon systems specifically designed and manufactured for export to other countries.