In 1971 The International Court of Justice in an Advisory Opinion on the Legal Consequences for States of the Continued Presence of South Africa in Namibia concluded that the mandate for South-West Africa had been validly terminated by the General Assembly in Resolution 2145 (XXI) of October 27, 1966, and that “the continued presence of South Africa in Namibia being illegal, South Africa is under an obligation to withdraw its administration from Namibia immediately and thus put an end to its occupation of the Territory.” Further, the Court said that:
States Members of the United Nations are under obligation to recognize the illegality of South Africa’s presence in Namibia and the invalidity of its acts on behalf of or concerning Namibia, and to refrain from any acts and, in particular, any dealings with the Government of South Africa implying recognition of the legality of or lending support or assistance to, such presence and administration.