Actually, there are humanitarian no fly-zones that Ukrainians can patrol themselves. It wouldn't require a direct involvement with the U.S. and would be of great help to Ukraine at the moment.

Putin already says we've declared war with sanctions so if he's going to push the red button, we can't stop him by being afraid to help Ukraine.

FYI: I drink filtered water and have had no exposure to COVID. Though "stupid" is, IMO, usually caused by ignorance--which can be cured.