However a recent development was Russian use of terminals on attack drones. Out of that Starlink was able to block terminals with certain velocity (and possibly bearing) in the region. In addition Ukraine got around to making internal registry of all frontline terminal allowing Starlink to white-list. So no it was a bit more than a tweet involved.
https://x.com/FedorovMykhailo/status/2017932529882296706
SpaceX worked with Ukraine together to register authorized Starlinks.
You obviously can’t simply geo-fence because the usage is not in Russia, but Russian troops using it in Ukraine.
And you can’t simply blacklist Russian use, because lots of devices with legitimate Ukrainian use cases were imported in privatly or by third party.
That is why cumbersomley legitimate Ukrainian devices must now be whitelisted.