If Russia is offering the jet to Pakistan then it is up-to Pakistan whether to buy it or leave under any circumstances from quality to price tag but on other hand, if PAF wants to buy subjected platform then it is made sure that how and when to buy because birds are not going to make it PAF in days or even months or one cannot say even in 2 years however, duration of delivery of complete order provides enough time to pay all but in installments. Money wouldn't be issue if SUs are must for PAF as where there is a will there is a way.
Even the influence element is weakened as India has fired it shot by going US and West so only concern remained to the friends is now money by narrating the usual lines.
However,
The real question to be asked is, whether PAF is interested to buy SU-35 or not?
Russians like to get paid. That is the only reason to sell weapons to countries as diverse as China, Vietnam, India, UAE, Iran, Syria, Venezuela, Ethiopia, Eritea.
My guess is that PAF is not interested at the Su-35 at the $80 million price tag