With 'only one country', I assume you refer to South Africa. Are you aware that the ANC itself approved of nuclear disarmament?
If you look at the Budapest Memorandum, Belarus, Kazakhstan and Ukraine also voluntarily gave up their nuclear arsenals by becoming a party to the Treaty on the Non-Proliferation of Nuclear Weapons in exchange for security guarantees.
If you look at the Budapest Memorandum, Belarus, Kazakhstan and Ukraine also voluntarily gave up their nuclear arsenals by becoming a party to the Treaty on the Non-Proliferation of Nuclear Weapons in exchange for security guarantees.