Zelenskiy just said that he's going to call Budapest Memorandum meeting. If he receives no response, he will consider it null and void and hinted - that this means that Ukraine will pursue creation of Nuclear weapons.
Ukraine may question Budapest Memorandum commitments - Zelensky in Munich
President of Ukraine Volodymyr Zelensky initiated consultations within the framework of the Budapest Memorandum, however, if they do not take place or specific decisions are not made on the basis of security guarantees for Ukraine, then Kiev may question the obligations of the guarantor countries.
"I, as president, for the first time initiate consultations within the framework of the Budapest Memorandum. Ukraine is doing this for the fourth time. But both Ukraine and I are doing this for the last time," he said on Saturday, speaking at the Munich Security Conference, reports Censor.NET from a reference to Interfax-Ukraine. Source:
https://censor.net/ru/n3317343