"Uri Friedman: Why did the South African government, in the mid-1970s, decide to embark on a nuclear-weapons program? F. W. de Klerk: The main motivation was the expansionist policies of the USSR in southern Africa. They were supporting all the [African] liberation movements—they were supplying weapons and training—and it was part of their vision to gain direct or indirect control over most of the countries in southern Africa. They financed the deployment of many thousands of Cuban troops, especially to Angola, and this was interpreted as a threat first by Prime Minister John Vorster, and following upon him P.W. Botha. [W]as never intended, I think, to be used. It was a deterrent. Because of apartheid South Africa was becoming more and more isolated in the eyes of the rest of the world. There wouldn’t be, in the case of Russian aggression or invasion, assistance from the international community. It was felt that, if we have nuclear weapons, and if we then would disclose in a crisis that we have [them], it would change the political scenario and the USA and other countries might step in and assist South Africa."