That's not what the Budapest Memorandum said, this was the actual promise:
>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".
Such action was indeed sought at the UNSC on March 15, 2014, in spite of the fact that there was no threat of nuclear aggression. We actually exceeded our obligations under the memorandum.
>Seems a bit shitty to take their nukes
They weren't their nukes, they were Russian nukes, and IIRC Ukraine had no way to actually use them as nukes, even if they wanted to.
That's not what the Budapest Memorandum said, this was the actual promise:
>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".
Such action was indeed sought at the UNSC on March 15, 2014, in spite of the fact that there was no threat of nuclear aggression. We actually exceeded our obligations under the memorandum.
>Seems a bit shitty to take their nukes
They weren't their nukes, they were Russian nukes, and IIRC Ukraine had no way to actually use them as nukes, even if they wanted to.