On the other hand, if you completely ignore tensions and keep up the supply in the case of war, interdependence ceases to be a deterrent at all. The real problem here is that somebody started a war; the isolationism is just one of the many bad consequences.

We will always have global trade.

Or maybe it's showing that it indeed is quite optimal to rely on other countries for your crucial infrastructure - it's just not advisable to anger those countries by breaking international treaties and committing war crimes?

Having to resign from this optimal strategy and isolating yourself is exactly the war deterrent that sanctions are supposed to achieve.