Using Starlink in Russia would be operating a radio transmitter without a license, or a license exemption, so they already have laws covering this.
Currently Starlink requires a ground station with a fiber internet connection that is located within about forty miles of the users (depending on local terrain such as mountains in the way).
Russia is big, currently Starlink could only cover small parts of Russia near the borders if a ground station is set up in a neighbouring country.
The satellites are in a low orbit so are only visible above the horizon from a smallish area of the earths surface. Customers only get internet when a satellite is directly in view of both the customer and a ground station.
The long term plan is for laser links between satellites. That is required for coverage out in the oceans or in countries where ground stations can't be set up (perhaps such as countries where the USA is at war so the military might want to use starlink without regard for local laws).
Starlink is reported to be far from getting laser links between satellites to work. As far as I can tell from a bit of reading, current Starlink satellites don't have hardware for laser links.