The South African government informed rebel leaders Jonas Savimbi and Holden Roberto in early November 1975 that the South African Defence Force (SADF) would soon end operations in Angola despite the coalition's failure to capture Luanda and therefore secure international recognition at independence. Savimbi, desperate to avoid the withdrawal of the largest, friendly, military force in Angola, asked General Constand Viljoen to arrange a meeting for him with South African Prime Minister John Vorster, Savimbi's ally since October 1974. On the night of November 10, the night before independence, Savimbi secretly flew to Pretoria, South Africa and the meeting took place. In a remarkable reversal of policy, Vorster not only agreed to keep troops through November but promised to withdraw the SADF troops only after the OAU meeting on December 9. The Soviets, well aware of South African activity in southern Angola, flew Cuban soldiers into Luanda 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.