The Budapest Memorandum on its own is not the only document that you should consult. We may debate the degree to which 'assurances' differ from 'guarantees', but considering the vagueness of international law I would leave interpretation of primary sources to scholars and statesmen.
In the eyes of the people in Europe, the US response to the war has been been lacklustre from the very beginning, only marginally improving after Russia's 2/2022 escalation.
There is not a single country in the world that has given more money and weapons to Ukraine than the United States.
If the people in Europe find that to be a lackluster response, then it is not surprising that Trump sent Vance over to humiliate them, because they need a wake-up call and they needed it yesterday.
In the eyes of the people in Europe, the US response to the war has been been lacklustre from the very beginning, only marginally improving after Russia's 2/2022 escalation.