Dont think so , because then China would lose a valuable portion of the market , they have plans to sell the J20 too so they would resist Pakistan going for Russian stuff - and they have a lot of leverage considering Pakistan is their all weather ally.Also they will be concerned about Russian support and spare supply during conflict times , add to that the logistical nightmare of Inducting aircrafts from three industries - U.S , China and now Russia . Their policy has been to progressively reduce aircraft platforms to 2 or 3 major ones ( JF 17 , J -10 B and F 16 )...
On the other hand , India's deals with Russia is not confined to a single aircraft deal. They include an air craft carrier, the FGFA , Brahmos 2 , Lease of a nuke sub ...the number of defence contracts is staggering . Both sides would never lose such a lucrative buyer-seller relationship on account of one sour deal...