Respectfully I disagree.
This is not a zero sum game where Russians give us a with us or against us ultimatum.
Russians still have billions of $$ worth contracts outstanding with us. Sukhois, FGFA, Brahmos, etc in addition to spare parts and service requirements. They won't jeopardize that for a couple of hundred million worth sales to Pakistan. Pakistan cannot be a replacement for India as it does not have economic heft to counter Indian buying power.
Strategically speaking Russia needs India to counter its growing dependency on China. Also Indians have never gone again Russia in UN and other forums despite of tremendous american pressure.
India was one of the few countries which supported Russian actions in Crimea even China was ambiguous about it. Crimean leader visited India with Putin in what was his only trip abroad till now. In short the Russians need the huge Indian market and legitimacy the support of democratic regime of India brings them in international forums, NO other country can offer them this combination
India knows it too that's why this game of courting Pakistan is useless.
The Russian relationship with Pakistan would purely be tactical one with an Indian veto over sales of weapons which can seriously undercut Indian security concerns in foreseeable future.
@nair,
@Nicky G