@humanhorseshoes @noelreports The Budapest memorandum did not oblige anyone to defend Ukraine in case of invasion. Russia broke its obligation by invading Ukraine, but this doesn't force anyone to do anything about it. Even if Russia nuked Ukraine or officially threatened to do so, the only obligation on the other signatories would be to "seek immediate UN Security Council action". As you can see, this memorandum is quite worthless.
Now aim is to provide new guarantees that are worth something.