Protecting Ukraine from genocide is one thing.
Entry into NATO is another.
There will be extremism, terrorism, violence for decades to follow after this blood bath. I am not so sure we should guarantee absolute protection for a nation that has been so ruthlessly slaughtered. For they will be desperately hungry for Russian blood. Ours should be for the protection of life. To step in on a case by case basis, with no guarantee beforehand. To help us avoid encouraging them, if they wanted to do something reckless months and years from now.
We cannot let a thirst for vengeance drag us into any future wars with Russia. The measure of aggression and innocence should weigh on our every action. A rebuilt Ukraine would need to demonstrate that it can democratically function first, and make any necessary concessions to work towards a lasting peace. Absent that, I would not want to give guarantees to the hundreds of thousands who want to avenge loved ones.
Remember, very clearly, this is not over when a ceasefire begins.