It's not just about a massive conflict kinetically disrupting those supply lines. Influcencing those supply lines is a key tactic in the day-by-day posturing and low-level conflicts of geopolitics.
That's what we have now in this cyber warfare stuff.
The reality is that we always have to push conflict to the fringes with "Tier 1" states (which I define as people with Nukes). The cold war answer was to fight using proxies indirectly. The modern answer is cyber/information warfare.
There were proxy wars sure, but the cold war clandestine ... er spycraft or whatever you'd like to call it has just embraced computers. The CIA and friends and the KGB/FSB and friends just got some new tricks in addition to the old ones.