It wouldn't work. It's not like they need to run the operation from inside Russia. They have actual people all over the world, including ordinary citizens, or employees at large tech firms inside the EU and US.

They can just use those people to acquire residential internet connections, or rent VMs. They can also run VPNs through other countries, like India. Are we going to block India as well? There's nothing you could really do to stop that outside of shutting the internet down completely.