I doubt the veracity of this claim.China nor Russia can entertain nuclear commerce or cooperation with Pakistan with the approval of the NSG.Even China's limited coop is mostly under the grandfather clauses of agreements China conclude with Pakistan log bfore she joined NSG.
With Pakistan's current standing status as the mecca of Islamic extremism,i doubt the Brahmins of NSG would even contemplate relaxing the caste rules of NSG for Pakistan.
Huh even India with all her goody goody image had to fire all her diplomatic cylinders