I think we (the west) did that ...

I think it depends. Talking with a friend in St Petersberg, last we talked about it was a few months ago so things can change, they are scrambling to bootstrap companies and industries. If they can successfully do that, it may not seize up. But here is the other side of that equation. Trying to stand up something like shops to machine parts in rapid fashion is going to end up with, yea they have parts, but they are low quality. So it may not completely grind to a halt, but it will still be crippling.

Now they could completely fail at bootstrapping those things, which yes, it will definitely grind to a halt. But any day now for the past 60-70 years Cuba was supposed to grind to a halt and well, they are still chugging a long. Maybe with lawn mower engines in their cars, but they still manage to get to point a from point b without walking.