Russia has banned them, sort of.
Although I don't think their methods would work here, or rather, I don't think they could grab the kind of power necessary.
Russia now has regional internet blackouts, were they effectively only allow a small number of white listed sites to be accessible.
So if you you literally cannot reach the VPN servers because only a handful of Russian government websites, preferred businesses, and UK banks (oligarchs gotta oligarch) are whitelisted, well then you banned VPNs, again, sort of.
They did roll out a government approved VPN for specific approved individuals and use cases, to a get around those blackouts....so that's something.