I think that governments should put up financial and other sanctions; putting up sanctions with networking would only aid those who set up the not so great Russian firewall, and their Chinese and Vietnamese equivalents. Also fragmenting the internet is a thing that could backfire.

I am trying to send my friends in Russia some info on what is going on in the world, without whatsapp i would not be able do that..

Also it goes both ways, for example there is no equivalent for genlib and sci-hub, there is just no substitute for these resources...