To add more
It really takes guts to be so shameless to copy almost every aircraft design be it
Chinese WS 10 A ~ Russian AL 31 F engine
Chinese J- 6 ~ Russian MiG-19 Farmer
Chinese J- 7~ Russian MiG-21 Fishbed
Chinas H-6 bomber ~ Soviet Tu-16 Badger
China Y-5, Y-7 and Y-8 ~Soviet An-2 Colt, An-24 Coke and An-12 Cub
Chinas new Yuan-class submarine ~ Russian Kilo-class diesel subs
China HQ-9/FD-2000 missiles ~ Russsian S-300 t
China's L-15 trainer jet ~ Russia's Yak-130
.........................................and this list goes on and on
Everyone knows how China had violated international copyright laws and copied one of Russias most lucrative military export itemsthe Sukhoi-27 fighter. One Russian analyst characterized the Chinese J11-B as simply a Russian design stuffed with local electronics.
These Chinese are real shameless!!!
P.S. I know Chinese and their cheerleaders won't agree to this list, please check specs and capabilities of the models I quoted and compare them with each other, you guys will be shocked to see the similarity, especially in design,
also I will keep updating this list!!
With word 'copy' the country that comes to everyone's mind is china 
