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What is known is that some components for the manufacture of warhead fissile material came from the PRC (most notably ring magnets). Also it is known that missile parts have been excanged across the pass from the PRC to Pakistan via truck. What remains a mystery is the extent to which the PRC provided actual technical aid. In point of fact, Pakistan has long sent its best and brightest overseas, to the US and UK to school (I have met a number of current examples). Due to the ill conceived and antiquated (ever since the collapse of the pro-US "northern tier" in earnest) "alliance" with Pakistan, Pakistani nationals have been allowed to hold jobs in places such as Lawrence Livermore Labs, among others. Not long after 9/11 the FBI arrested a Pakistani national who was working there for espionage. The case never made the lame stream media. I have no idea what was the outcome.