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
Cuban intervention in Angola first country to send troops to Angola in March 1975 and to engage in fighting against the MPLA by the summer of that year. In the summer of 1974 China was first to act after the Portuguese Revolution and posted 200 military instructors to Zaire where they trained FNLA troops and supplied military assistance. Chinese involvement was a measure against Soviet influence rather than that from western countries. On 27 October 1975, they were also the first to withdraw their military instructors. UNITA, which split away from FNLA in 1965/66 was initially Maoist and received some support from China. North