I think he has already commented that he is ready to (de)activate Starlink on any region if asked by the US government.
They are already a client for a Starlink-like service strictly for military use.
Eminent domain exists for a reason. If he does anything, just seize it. SpaceX existence is because of the US Defense department. Elon may be rich, but does he want to stand against the nuclear superpower where he lives? His life is in palm the government, and he could be crushed, both literally and figuratively.