This old man, Gilbert Doctorow, is the voice that seems to me the most reasonable voice on what can really happen if the crazy western leaders continue their campaign to provoke the bear (Napolitano begins by asking him about what Putin recently said in the interview in St. Petersburg).
There will be no nuclear apocalypse. But Kiev and Poland’s military airport will be incinerated under tactical mushrooms (the US will not be able to intervene by launching a nuke on the Russian territory because that would be suicidal).
This is the best-case scenario and would mark the beginning of the end of the American interregnum in Europe, which dates back to 1945.

