I don't think the Russians can sell us out to the Pakistanis. Even if they did, that will kill their reputation.
New research is always possible, but I don't think the Russians will be a good partner in the future for big ticket JVs. If you look at what might happen after 2030 or so, Indian companies may very well insist on getting full control of the projects rather than share it with another country. Even the forces will want to protect IP. We saw that recently with the FGFA, where the IAF wanted to prevent their specific version from being exported to other countries.
Whatever's being done to China today will happen to India after 2030. You can expect that all major countries will eventually go into a technological denial spree the moment we start threatening all their markets. I mean, think about it, India is the only country in the world that can sell to countries allied to the East and the West. We can sell to the US, Germany and UK, and also sell to Russia, Algeria and Vietnam. And here we have Modi wanting to make India a defence exports powerhouse by the time his new terms ends. So he's already signalled the threat India will pose to global markets.
To top that off, we won't need JVs for the sake of financial support in order to sustain a project.
Not to mention, DRDO will veto most of the JVs anyway, like they did with FGFA. A very important point to remember.
I'm not saying cooperation will disappear, but right now, all our JVs are just technology imports for stuff we can't yet build on our own, and that will end post 2030 because DRDO has started catching up.