Bonzo, a palace coup, putsch or assasination would be hampered by covid testing and 2 weeks quarantine to get close to Putin. :^/
The truth is Putin is as isolated as a former Trump with very few old crazy KGB yes man pals around him. If Putin wants to hear what advisors have to say, he tells them what to say.

Switzerland banks are warning Russain Oligarchs that their accounts may be frozen. A word to the wise Russains will give most of them a chance to move and hide fortunes. The loyalty of these oligarchs to Putin is problomatic. London banks, similar to Switzerland, are wimping out for now.
Sweden and Germany will give weapons directly to Ukraine. The ruble dropped 30%. 110 rubles now buys a dollar.

Putin has thrown 'all in' with a go big or go home strategy.
A Russain occupying army will face hardships as time goes by as in any occupying army after street by street battles. History shows Ukraine has thrown out Russain occupying police before.