Consensus on we believe your nation should not exist?
Ukraine already once found the consensus of give up worlds 3d largest nuclear arsenal in exchange for security guarantees. It worked out great.
regarding the security guarantees, it appears that memorandum was not legally binding, and provides no real guarantees, as per the US themselves, and pre-2014.
"Regardless, the United States publicly maintains that "the Memorandum is not legally binding", calling it a "political commitment"."[0]
"not legally binding", below.
"Media Statement by the U.S. Embassy in Minsk
April 12, 2013
Repeated assertions by the government of Belarus that U.S. sanctions violate the 1994 Budapest Memorandum on Security Assurances are unfounded. Although the Memorandum is not legally binding, we take these political commitments seriously and do not believe any U.S. sanctions, whether imposed because of human rights or non-proliferation concerns, are inconsistent with our commitments to Belarus under the Memorandum or undermine them. Rather, sanctions are aimed at securing the human rights of Belarusians and combating the proliferation of weapons of mass destruction and other illicit activities, not at gaining any advantage for the United States."[1]
seems that guarantees weren't worth the paper written on, in the first place, but everyone keeps on talking about them as if they were ironclad somehow.
The sad truth is there was no real guarantees at all, just an empty promise to make it politically feasible for the Ukrainian politicians to sign.