You mean the one russia and the US both signed with Ukraine, and then both broke?

He means the NPT. en.wikipedia.org/wiki/Treaty_...

Yes, I know. I meant the "Memorandum on security assurances in connection with Ukraine’s accession to the Treaty on the Non-Proliferation of Nuclear Weapons" Otherwise known as the Budapest Memorandum. The assurances given to Ukraine in return for their joining the NPT. Assurances now broken.

Can't imagine why the NPT is now falling apart, it's such a mystery.