OK.
Here’s answer to question, though. US blows up Russia and Russia blows up US.
I don’t think that’ll come to pass.
When all is said and done, Russia and the USA will stand by and let the Iranians and Israelis blow each other to kingdom come, and issue sternly worded memorandums regarding restraint. There’s an old saying which applies to the realpolitik concept; No one let’s themselves get killed for an ally.
But the time it’s all settled, Tehran, Tel Aviv, Qom and Jerusalem will all bear a remarkable resemblance to Hiroshima and Nagasaki (that depends on how many nukes the Iranians can not only manufacture/assemble, but actually deliver....nukes are pretty useless if you don’t have an adequate delivery system). Though of course, in a nuclear exchange between the two, I can safely say Iran will come out the worse.
How does russia blow up USA?