The actual on the ground resistance was of central importance in the end of South African apartheid, but the international pressure and sanctions greatly increased the need for negotiations to begin. The point is to increase the pressure to change leadership through democratic means.

This could hopefully happen somewhat faster with Israel, given that the government isn't a literal Nazi remnant, as the South African government was. (Though, ironically, the main arms supplier to South Africa during the arms embargo was Israel, often reselling weapons from the United States. Sigh.)

"By the late 1980s, the South African state was in profound crisis, crippled by international sanctions, a stagnant economy, and widespread resistance. Recognizing the unsustainable nature of the perpetual conflict, the government under P.W. Botha began tentative, secret contact with the imprisoned Nelson Mandela and the exiled African National Congress (ANC) leaders."

https://en.wikipedia.org/wiki/History_of_South_Africa_(1948%...