although there was military cooperation between south africa and israel, israel did not help with south africa's nuclear program. had israel done so, south africa would have had a developed nuclear arsenal. at the time the military cooperation took place, for a span of a douzen years, israel had no choice given the boycott placed on her by huge numbers of the international community. this should serve a lesson to those who want to boycott israel. it is not a good idea to push a desparate country against the wall. in any case, other countries in the west have done much, much worse.
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from the article: Israel denies offering nuclear weapons to Apartheid South Africa