You give him too much credit, it's already proven that it's not too hard to get him economically, he is hurting from it already pretty badly. And the moment Putin says "Fuck It" he doesn't have a giant red button he just gets to push and launch stuff, he actually has to give the orders to others who actually have to control the stuff and will know that they are killing their own families if they follow that order.
Putin gives that order, there is a good chance he will personally end up killed before he sees it followed. No matter how crazy he wants to be, the world will largely outlive him, Putin seems to love Russia and fantasize about the return of it's power and he knows that doing that removes Russia from the world stage permanently.