> Such as air-gapped systems, or something that is physically isolated from foreign access.

Air-gapped systems are better, but still aren't fully secure (ex. Stuxnet), and are becoming less secure as other technology advances.

> We need technological solutions for this problem, not new international laws or, holding nations accountable and so on.

While I do agree that technological solutions are better, why shouldn't we have international laws that deter this kind of behavior? I'm sure that nations (and private actors) will try to exploit weaknesses regardless, but why not have consequences when they've been caught?

We can't only put blame on inadequate tech, similar to how you can't only put the blame on a bad lock on a front door. Those with malicious intentions should face appropriate consequences for actions that harm others.