The settlement proposal contained a negotiated compromise. Described as a "working arrangement" which would "in no way constitute recognition of the legality of the South African presence in and administration of Namibia", it allowed South Africa, through an Administrator-General designated by it, to administer elections, but under United Nations supervision and control exercised through a Special Representative of the Secretary-General, who would be assisted by a "United Nations Transition Assistance Group" (UNTAG). Later in 1978, the UN Security Council approved a resolution with a specific, timetabled plan for SADF withdrawal and Namibian elections and authorized UNTAG, with a combined military and civilian force, to facilitate the transition to independence. The plan depended on an agreement on a so-called "D-Day" for the beginning of the ceasefire. However, by that point, South Africa had been drawn into the conflict in Angola in an attempt to crack down on the SWAPO insurgency and made a new demand: the so-called "linkage" of the withdrawal of Cuban troops from Angola and their withdrawal from Namibia. Other issues, such as the composition of the UNTAG forces and the status of Namibia's important port Walvis Bay also kept the parties from reaching an agreement on a ceasefire date.