We were party to the Budapest Memorandum in return for
Ukraine agreeing to give up nuclear weapons. At one time Ukraine had about 2,000 nuclear warheads.
So far we’ve welched on the deal.
Bill Clinton's signature on the Budapest Memorandum was a cynical ploy, because Clinton knew that the United States could never be bound by such a non-treaty "agreement." President Clinton never submitted the Budapest Memorandum to the Senate for its approval, therefore it has no force under our Constitution.
No president has the authority to bind the United States of America to any international agreement that is not ratified as a treaty by a two thirds vote of the United States Senate. This is one of the basic Constitutional checks and balances (between our three co-equal branches of government) known as "Advise and Consent." We are governed at all times by our Constitution -- not just when it is convenient.