If this is really all that Russia wants then this is a really stupid war. (2) has defacto already happened. (3) Constitutions can be changed and there's no re

If this is really all that Russia wants then this is a really stupid war. (2) has defacto already happened. (3) Constitutions can be changed and there's no reason Ukraine can't abrogate the treaty in the future. They were never getting into NATO while in a shooting war with Russia any way. If you're running from a bear you don't make big sudden movements. You slowly back away until the danger has passed and then do whatever you wanted.