It's smells like armegeddon to me. However hard to fathom, I think he's gone mad and might actually do it
He's refrained from turning Ukrainian cities into mid-90s Grozny so far, I'm not sure he's going to be looking at mutually assured destruction right now.
Granted it is a bit of a worry if things get silly, he's a very old man by Russian standards, close to the typical life expectancy for Russian men, rumours he might be ill too.... don't really want an ego maniac who doesn't have long to live anyway doing something silly.