No country on face of earth helps any other country on nuclear weapons program. When any person makes such silly comments that Pak nuclear program is China supplied, you insult decades of hardwork Pakistani scientists worked on this program. I personally know many people in Kahute (KRL) in 1980s working on this project (Many passed away by now, old age) who dedicated their lives on it. I personally know from the same people that China was of the view, that Pakistan do not need its nuclear weapon program as China its ALLY is a nuclear power and won't let nuclear bullying against Pak. US / EU alleges that Dr.A.Q.Khan was running a black market of nuclear technology all over Europe and "stealing" secrets & tech. If Pakistan really had to get off the shelf from China, then we really had to bother going all that trouble in Europe?
BTW, It was not just Pakistanis scientists, but Iraqis, Iranis, Indians and even Israelis all used to go to various EU tech giants, universities, institutes etc. They never used to tell that they were coming from nuclear weapon program of their country, A front private company used to be propped up as an employer. The purpose was to just seek knowledge & experience in various fields that can be relevant. Mosaad agents used to be on lookout. Many arabs were assasinated by them. Anyways, long story short. Pakistan's nuclear program is a whole dedicated national effort. Tens of thousands of employees worked on these organisations. Its not something that can be purchased ever.