In the first weeks of the war, Russia targeted communications infrastructure in Ukraine. They performed cyberattacks against Viasat, rendering thousands of satellite modems unusable. They performed destructive cyberattacks against Ukraine government and telecommunications targets. Cell towers and fibre optic lines were targeted, as well as electricity infrastructure. And they started aggressively jamming wireless communications. Much of this was disastrously effective.

Starlink was one of the only reliable ways Ukraine had for remote military communications, without which Ukraine would have not been able to defend its territory nearly as effectively. Though it's impossible to know, it's plausible that Ukraine might not exist today but for Starlink.