Selling cars, worldwide, made sense when they weren't always connected to the mother land. Germans selling you a BMW in the 80s? You've got the key: you turn the key. They couldn't turn off all the BMWs if suddenly the US were to be at war with Germany again.
But this madness of cars receiving OTA updates and remote subscriptions and whatnots?
Imagine an enemy country using zero-days to track a military leader via their personal device(s), then disabling their smart civilian vehicle they use to commute to work. Final leg is they had previously parked drones along their expected commute routes for just such an occasion and..
edit: see interesting hypothetical future war series on YT, specifically this bit.. https://youtu.be/drr7mmibt9E?t=157
Ah, think about it, the luxury of owning your own car, you and only you. I can almost imagine it. The future, its bright.
Doing business with the enemy always comes with a risk. For countries that don't build their own networking equipment (including the PCBs and chips), you have to accept some level of risk or you have to avoid such technology all together.
Also that is an "eventual problem".
The era of smart everything exposes you to pinpoint time/place/person disablement by the enemy.
The philosophy and structure we rest on is much more precarious than our technologies.
Or indeed with allies, as Europe is just finding out...
Heavily sanctioned countries like Afghanistan and Iran have one thing going for them, and that's that they can't easily build a dependence on foreign technology (though not having such technology at all is arguably just as bad).