Sorry, but you are nuts, we are not on the verge of WWIII, Putin is not as insane as you are, and is not wanting for Russia to disappear in nuclear dust.
Russia is weak and and is just trying to get away with what it can, until someone slaps his hand.
This is your own nutty obsession, in your own head.
Soviet Union/Russia has never attacked a strong opponent, they only invade and push around far smaller & weaker countries, once confronted with strong opposition, they back down, just like in case of Cuban crisis and many others. Besides, it's not a matter of any military pressure, real economic sanctions should be enough and anyone who thinks that Putin would use nukes once Russian entities are banned from financial markets, is really nuts. He would have to back off or else oligarchs would take him down. That's it.