Are you sure about that? Wikipedia says the following: "
3. Refrain from economic coercion designed to subordinate to their own interest the exercise by Ukraine, the Republic of Belarus, and Kazakhstan of the rights inherent in its sovereignty and thus to secure advantages of any kind.
4. Seek immediate Security Council action to provide assistance to the signatory 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".
Both seems to not happen as stipulated.
Edit: I didn't read properly, 4 obviously didn't happen, my bad.
The actual memorandum is shorter than the Wikipedia article about it. The English-language portion is literally only three pages of double spaced text.
I guess you could argue the US is kinda violating 3, since I think the Trump administration tried to ask for future financial reparations in exchange for support during the war. But 4? This isn't a nuclear conflict yet right?
3. Refrain from economic coercion designed to subordinate to their own interest the exercise by Ukraine, the Republic of Belarus, and Kazakhstan of the rights inherent in its sovereignty and thus to secure advantages of any kind.
4. Seek immediate Security Council action to provide assistance to the signatory 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".
Both seems to not happen as stipulated.
Edit: I didn't read properly, 4 obviously didn't happen, my bad.