Of course its is copied but Russia and Israel had not given anything, has Israel supplied the radar system, avionics and engine of the J 10? Russia and Israel had not shared anything with China. China had bought some SU 27, dismantled and learned how through trial and error everything was made. Then China produced the better J 11. Lets take the SU 30MKI, body from Russia and all avionics, radar, traning etc come from Israel. China had taken the Lavi design but all avionics, radar and weaponry had not been supplied by Israel as is the case for the Indian Sukhoi. In 1999, the US had imposed a veto on the suppy by Israel of an early warning radar. This same radar has been supplied to India and now India is encourage to buy the Awacs.
Regarding the helicopter, either u r stupid or lack commonsense or both. The Dolphin chopper had been bought by China from France before the embargo of 1989. Thus after 1989, it could not buy any more nor any chopper from the EU or US and no spare parts. China has thus learned by itself how the Dolphin was made, how it was designed etc then it has produced its own version otherwise there would be no helicopter at all for China. If there was no embargo China would have imported more Dolphin, Gazelle and the Tigre Gunships. Regarding engines, China has asked for a derogation from the West and US to be able to import heavy lift helicopters on the aftermath of the Sichuan earthquake which had claimed the life of thousand of civilians including thousand of children. Helicopters had proved useful in rescuing life but the US had vetoed the supply of such helicopters even for humanitarian reasons. Of course China has to use civilian engines to power its helicopters, as it cannot import engines and all Western countries refuse to collaborate with China. China has to find ways to make helicopters and become a superpower otherwise China would still be like how it was in the 60s and similar to countries like Cuba. In Cuba you would find 50's vintage car because since the embargo of the 1960's, Cuba cannot import and export thus Cuban have to travel using those vintage cars. Even without embargoes, there is still no toilets in India, Indians still open defecate like in the 19th century when it was enslaved by its colonial Bristish master. Even without embargoes Scatland cannot produce any decent weapons except human defaecation.