[Thorrez]

There are 6 things on the list. This one is the closest to promising to defend Ukraine:

>Seek immediate Security Council action to provide assistance to Belarus, Kazakhstan and Ukraine if they "should become a victim of an act of aggression or an object of a threat of aggression in which nuclear weapons are used".

I don't know exactly what "Seek immediate Security Council action" means. What if the US seeks it and doesn't find it? Is that in compliance with the memorandum?

[htfu]

They did. Guess what happened? Vetoed by Russia.

[rurban]

Such vetoes are invalid when the veto state is directly involved into the conflict.

[nradov]

While that is technically correct based on the UN Charter, it's meaningless in practice. None of the permanent Security Council members are willing to take direct action on this issue.