Yep, nobody will be sued when Ukraine will nuke RF in violation of Budapest memorandum. So what?
"The memorandum was originally signed by three nuclear powers: the Russian Federation, the United Kingdom, and the United States. China and France gave somewhat weaker individual assurances in separate documents.
The memorandum included security assurances against threats or use of force against the territorial integrity or political independence of Ukraine, Belarus and Kazakhstan."
2. Hitting Moscow from across the border with a real late 80s ICBM isn't exactly complicated for a country like Ukraine. Especially in this day and age. You drastically overstate the role of centralized C&C here. I want to stress that Ukraine demilitarized MODERN facilities. These aren't 60s hold overs.
The West, of course, lied too. That doesn't absolve Russia however.
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1) Respect Belarusian, Kazakh and Ukrainian independence and sovereignty in the existing borders.[16]
2) Refrain from the threat or the use of force against Belarus, Kazakhstan and Ukraine.
3) Refrain from using economic pressure on Belarus, Kazakhstan and Ukraine to influence their politics.
4) 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".
5) Refrain from the use of nuclear arms against Belarus, Kazakhstan and Ukraine.
6) Consult with one another if questions arise regarding those commitments
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I don't see any commitments being violated here on the part of "the West." Most of the list is about not attacking Ukraine, rather than some commitment to proactively come to their defense. Maybe we can quibble about the wording on 4) a bit... but I would imagine it only covers concrete nuclear threats.
I should be clear, this is the Wikipedia summary. The actual wording seems pretty similar (although it is a bit wordier).
I'm a Pole living in the west and the perspective of Putin's greedy gaze turning so close to my motherland is quite terrifying. I think your conclusion that I somehow "conveniently" forgot about Russia being the culprit here is a bit too far fetched here.