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I won't mention the US for the obvious reason that Trump would never nuke all his potential investments in Russia

Ukraine's been attacking Russian territory for quite some time. The initial fears in some quarters that such attacks would bring on nuclear retaliation have subsided, and Russia itself only resorts to the threat nowadays when feeling particularly powerless.

I don't think Russia has any appetite for bringing on its own extermination by going nuclear in any circumstances. It has two major population concentrations and, as Ukraine's proven, few major effective surviving air defence complexes apart from those concentrated around Putin's Valdai palace. It would be very vulnerable in ways its chosen enemies largely aren't.