Vladimir Putin is talking tough because he wants to move the war from Ukraine to a larger venue that invites the Free World. Why? Because he has nothing left but any nuclear armament.
Vladimir Putin has stayed as the Russian president far, far too long. He needs to retire immediately and end the aggressions he thinks he can wage which ultimately will invade Russia itself.
Sometimes I really think leaders like Putin take the wrong message from the USA's victory over Japan in WWII. It is easy for military leaders to sit back and examine the aftermath of the WWII use of two nuclear bombs and think that is a viable solution. It is not.
After WWII the USA began reparations. Those reparations were extensive and brought a new society to Japan. Those reparations changed the future of Japan, HOWEVER, the USA never took Japan as a province. The surrender of Japan also provided for a culture that adheres to the new ruler. In other words, if a Japanese emperor was vanquished, the new emperor would receive the loyalty of the people. That loyalty was a survival mechanism, so, the movement of Japan to an entirely different country was highly cultural. That is not the case with every country after WWII.
Post WWII the USA has an ally, not a colony. Japan governs itself. The bombs dropped by the USA over two cities in Japan were to end a war, not begin a new one and has never been repeated.
The plans to take parts of Ukraine and the withdrawal of the Russian forces could be an overture to the use of nuclear devices. It would be a folly if Putin thinks he can get away with such tactics.
The Ukrainian military should consider further evacuations of citizens and a withdrawal as well, if nuclear preferences are going to be deployed over these so called annexed provinces. It will render the land unusable, but, Russia is used to exactly that. If Russians can't live there why should everyone else? There are no words to describe Putin at this moment in history, except, Satan in flesh.