Elon turning off Russian access to Starlink by whitelisting only authorized terminals in the region was a turning point for Ukraine's success. The conflict has proven that modern warfare depends on Starlink and its mimics.
Here's the result of Russia's efforts:
The specifics of an implementation of this are objectively absurd. Power requirements alone make this a non-starter. If that weren’t enough, it would be a declaration of war.
I'm sure they are experimenting with directed-energy ASAT technology though, because why wouldn't they?