They didn’t even say that. Unless there’s a different agreement, but the Budapest Memorandum never mentions anything about security guarantees or protection.

Doesn’t change the fact that Trump is a traitorous piece of shit, that the US is an unreliable ally or that helping Ukraine is the right thing to do for many reasons but let’s at least ground things in reality. Unless there’s another agreement I’m not aware of, I’m no history expert but I know I was surprised when I actually read the text of the agreement because I hear this talking point a lot.