U.S. President Clinton, Russian President Yeltsin, and Ukrainian President Kravchuk after signing the Trilateral Statement in Moscow on 14 January 1994.
The Budapest Memorandum on Security Assurances comprises four substantially identical political agreements signed at the Conference on Security and Co-operation in Europe (CSCE) in Budapest, Hungary, on 5 December 1994, to provide security assurances by its signatories relating to the accession of Belarus, Kazakhstan and Ukraine to the Treaty on the Non-Proliferation of Nuclear Weapons (NPT). The four memoranda were originally signed by four nuclear powers: Ukraine, Russia, the United States, and the United Kingdom.
Memory hadn't failed me. Clinton concluded what Bush had started: