Spare us the hyperbole. Russia will not nuke us for supplying arms to the Ukrainians, any more than we nuked them for supplying arms to Chile (under Salvador Allende), Cuba, Nicaragua, North Korea or North Vietnam.
Russia supplied weapons to separatists. Turned out terribly. We supplied weapons to the Syrian rebels. Turned out terribly.
Perhaps time to keep our weapons to ourselves? Perhaps use them on the Central American countries currently launching an invasion of Texas?
Archduke Ferdinand moment?
Hyperbole aside, a confrontation between a resurgent Russia operating on its own nearby soil and American interests there - whatever that may be - can escalate and have nasty consequences.
Nobody thought that shooting one little government official in serbia would destabilize the world for 40 or 50 years either.
Russia can easily back out of it’s two faced help via a via Iran and a nuclear Iran will be a nightmare.
There are many other options as well not to mention the disaster of America interests being kicked aside as Russian forces do as they please there.
Now if you want to destabilize that area of the world - and that may be a credible goal - for the next 20 years, then yes, pour in arms next to Russian territory.