In April 1974, before the revolution, Marcelo Caetano was apparently toying with a plan of having Angola proclaim a UDI later in the year. In 1972, the constitution had been changed whereby Angola and Mozambique were elevated to the status of "Estados Ultramarinos" or "Overseas States" and the Portuguese government began publicly mentioning a "progressive autonomy" for both territories. According to some government insiders, in November 1974 upon reaching the age of 80, Admiral Américo Tomás was slated to step down as President of the Republic and this was to be when a plan to finally rid Portugal of the albatross of the colonies was to be put into action. Portugal's president was a hardliner whom firmly believed in maintaining the overseas empire at any cost, whereas his premier was a bit more pragmatic.
The idea was to foment some sort a disagreement between the metropolitan government and Luanda over the construction of an oil refinery for Cabindan oil in Lobito. The metropolitan government would veto this and the Legislative Assembly in Luanda would protest and leading to a mini-revolt against Lisbon by August 1974. This would lead the Legislative Assembly to proclaim Angola's independence with its Vice-President, Joaquim Mendes as Interim President. The Governor-General, Fernando Santos e Castro apparently was informed of this and was to return to Lisbon with his entourage, whereby the independence would be a fait accompli. Pretoria was to be informed of this plan to immediately fill the military vacuum left by Portugal's departing troops. The new government was apparently to include UNITA and pro-western members of the government.