If the USA nuked themselves to blame Russia, how would we know? Not like we would ever stage an attack on our own soil. That certainly never happened and as the recent pandemic showed, the Gov’t is deeply concerned about our health… They did produce the miracle vaccine after all.
Does Israel have nuclear subs? It just takes 1. Not that our greatest ally would ever attack us to pull us into war - that certainly has never ever happened.
So (((hypothetically))) how would we know?
I can't see how you would be able to know, unless you were part of the group that set off the nuke. Bomb debris identification would be mostly useless, since it would be easy to plant traces pointing to Russian made nukes. My only thought is that Russia would certainly attack multiple targets, a single nuke would be much more likely to be from terrorism, foreign or domestic.