Are you advocating for Russia to strike NATO countries for supplying weapons? That’s basically advocating for nuclear war, pretty bad take overall.
Thats never really been grounds for war in the past.
Cuban Missile Crisis ring any bells? The crackers nearly destroyed the planet over it.
We have gone far further than any of those.
Imagine if the Soviet Union gave Vietnam missiles and explicit permission to strike US cities during the war.
That is an entirely different scale of involvement that has never been tested against a large power before.