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I don't really see China directly selling nukes to Saudi Arabia, for they are quite serious and cautious players in world politics. But the fact is, the Saudis do not need Chinese expertise if they can get hold of some Pakistani scientists to which the country is doubly sacred by the holy towns of Mecca and Medina.
Another option could be Saudi Arabia getting hold of the potential Iraqi WMDs, since the regional politics are, to say the least, byzantine enough to breed strange bedfellows...