Say a black sub-saharan Country tries to develop nuclear weapons during apartheid. does South Africa try to bomb it like how Israel bombs Arab countries that tried or attempted to bomb Pakistan
Well, it might depend WHICH subsaharan country we're talking about. One of the front-lines that was heavily backing the ANC, yeah, I could definitely see the RSA pulling off an
Operation Opera.
Now, if it were Malawi under Hastings Banda, which was generally pro-western and accomadating toward South Africa, Pretoria might not be so paranoid. Though they might kinds wonder "Hmm, why does Malawi suddenly think it needs nukes anyway?"