[dexen]

>In a world with ICBMs

Quite the opposite. ICBMs have somewhat symmetrical threat and defense model. You use similar technologies for both, and you have actionable amount of time - some 20 minutes - for observation, decision taking, and deployment of countermeasures.

Assuming the station is deployed on geostationary orbit (some 36'000 km above equator), the flight time of the electromagnetic waves is just over 0.1 second. Good luck deploying any countermeasures.