Putin is absolutely capable of tactical nuking military sites and airbases within Ukraine. He's probably willing to do that to bordering NATO countries if plan

Putin is absolutely capable of tactical nuking military sites and airbases within Ukraine. He's probably willing to do that to bordering NATO countries if planes are flying out of them and Putin's back is against the wall. He'll take that next step that you can't fathom in order to stop you, since he figures you'll back down and won't escalate. Then, if we launch try to take out his nuclear capacity then he must launch all his missiles, and you've got WWIII and the end of the species more or less. If you play the tit-for-tat ratcheting up escalation game with Putin then all of humanity is going to lose that one. Right now its somewhat restrained since his generals won't want to launch nukes at NATO over the aid that has been given so far. When you cross a certain line so that Putin can argue that NATO bases in Europe are the proverbial dagger pointed at the heart of Russia and they must go so that Russia doesn't fall, then its much more likely that you've handed him the rationale for a tactical nuclear strike that his generals will follow.