But there's one quirk to the story: US has signed up for it on December 5, 1994: https://en.wikipedia.org/wiki/Budapest_Memorandum_on_Security_Assurances https:

But there's one quirk to the story: US has signed up for it on December 5, 1994: https://en.wikipedia.org/wiki/Budapest_Memorandum_on_Security_Assurances https://en.wikipedia.org/wiki/Budapest_Memorandum_on_Securit... Too bad that document was very high-level, without specific procedures, timelines and liabilities listed in case of a breach. But nevertheless, it's a very real and legal grounding for fighting for Ukraine.