Ukraine

But that's like saying that radios are unjamable because they use different frequencies. They're not unjamable they're just harder to jam.

My guess is there's different levels of fallback, Humans can pilot it when there's a signal, if that fails it can use GPS with some kind of pre-selected target, and that fails it can use on board tracking.

However I suspect that the best anti-electronic warfare attack it has is just relying on the fact that the Russians haven't got it switched on. Like how most of the autonomous assault boats rely on the fact that the Russians never seem to actually have any guards on duty.