Blowing up any nation with full force nuclear weapons is a suicide note.
They won't do it. But they may use limited nuclear attack on a NATO nation like Poland, or a wannabe NATO nation.
That would be very foolish indeed.
Rebellion is rising in Russia. It's rising in their Army as well.
There will be a tipping point where all hell breaks loose...within Russia. That's a way off now but the longer the war goes on the more certain a serious uprising is.