Has Putin gone insane?

ANSWER: The following ex-Russan oligarch, who knows Putin quite well, thinks that Putin literally went insane when he realized that Ukrainians were not welcoming his invaders and that that was why he started bombing Ukraine. He says that the only way to stop Putin is with force or with the threat of force. He also says that if Putin wins in Ukraine, NATO countries will be next. 

That means that we cannot let Putin win in Ukraine, which means we need to give Ukraine ALL the weapons it needs to stop Putin.