There is zero chance that anyone can invade a country and take its semiconductor infrastructure even vaguely intact if the defenders are disinclined to allow it.

A cup of coffee dumped in the machinery would destroy most of it beyond all hope of repair, let alone something fragmentary and full of nitrogen bonds.

The only sanction you could perform would be "no chips for anyone, anywhere".

And in such a, uh, kinetic, situation, I'm absolutely sure neither side will allow the other to retain working facilities that don't undergo very unfortunate accidents. Even a sudden power cut can be devastating. A foil balloon was enough to take out multiple fabs in Germany, and Samsung dropped 3.5% of global flash supply on the floor from 30 minutes down.

MAD doesn't come only in nuclear flavor.