Cuban intervention in Angola the requested financial assistance (100,000US$) it received from Yugoslavia. Portugal's sudden retreat from Angola and Mozambique in 1975 ended a history of South African military and intelligence cooperation with Portugal against the Angolan and Namibian independence movements dating back to the 1960s, later formalized in a secret alliance codenamed Alcora Exercise. It also ended economic cooperation with regard to the Cunene hydro-project at the Angolan-Namibian border, which South Africa had financed. South African involvement in Angola, subsumed under what it called the South African Border War, started in 1966 when the conflict with the Namibian independence movement, South West Africa
1970s in Angola the week before independence. While Cuban officers led the mission and provided the bulk of the troop force, 60 Soviet officers in the Congo joined the Cubans on November 12. The Soviet leadership expressly forbid the Cubans from intervening in Angola's civil war, focusing the mission on containing South Africa. In 1975 and 1976 most foreign forces, with the exception of Cuba, withdrew. The last elements of the Portuguese military withdrew in 1975 and the South African military withdrew in February 1976. On the other hand, Cuba's troop force in Angola increased from 5,500 in December 1975 to 11,000 in