I had a random thought that in hindsight, seems rather obvious and somehow lazy. But I think I'll make a note of it here in the chance there is something to it.
That theory would explain a lot, including the sudden and alarming rise in Western jingoism propagated by our media in lockstep with our uncharacteristically united political factions.
Even if it were true, and even if the Russians cashed in such a claim, I'd imagine it would take many years, possibly decades to confirm, especially in the face of the immense and inevitable push back from pretty much every Western media outlet.