U.S. jurisdiction is special. Since Elon’s tantrum, the DoD signed a contract for service. Sevastopol has been attacked since with Starlink equipped naval drones. Any limits on Ukrainian usage since were placed by the Biden admin.
If you have doubts about the resiliency of Starlink to a hostile adversary at war, ask the Russians how successful they have been at jamming Starlink for any appreciable amount of time and space.
Short of deorbiting the entire constellation of satellites, which is practically impossible even with nukes (recall the Russian orbital nuke panic last year), there is nothing that Russia, or China can do to effectively block a Starlink cell network in their own territory.