Most of it is tech transfer or stealing trade secrets not copy. Copy is just a myth that is propagated , a cover so no one ask tough questions. You are delusional and stupid if you think that Chinese just cyber attack and steal know how.>Chinese hardly copy
Holy f**king shiet, please stfu with your BS. Only thing that china does is copy and reverse engineer....despite that most of the their system are sub par, take their engine which is a shitty copy of russina engine, their whole aircraft program is based on reverse engineering soviet/russian aircraft or stealing designs from Americans like they did for j20.