And Rhodesia/Zimbabwe was during the majority of South Africa's apartheid years, another apartheid state and RSA ally. Then it became, and continues to be, an absolute basket case of a nation-state.
Zimbabwe in the 80s was actually still fairly prosperous. He was also the darling of the West in this period, precisely because he had pretended to be so moderate. He flew to the UK regularly and got on well with Margaret Thatcher. He constantly fought out photo ops with the British royal family - especially Prince Charles (he once attended a meeting with the Pope solely to shake Prince Charles' hand and to be photographed doing it). He played nice with the whites, allowing them to keep their reserved seats in Parliament until 1987, as per the Lancaster House Agreement, and right up until the late 80s he had regular meetings with Ian Smith and had whites in government. It's easy to forget now, but for the entirety of that decade he was viewed in the West as basically the pre-Mandela Mandela.
He also played nice with South Africa, behind the scenes, precisely because Zimbabwe's continued economic prosperity was entirely dependent on South Africa, despite putting on a show for the black African states of playing the victim. He never allowed the ANC to operate within Zimbabwe, and entertained South African trade delegations at State House throughout the 80s. In fact, Zimbabwean intelligence (which, in the 80s, was still largely staffed by the same people who had run Rhodesia's intelligence services, by design - Mugabe begged Ken Flower to remain at his post after 1980) cooperated fully with South African intelligence to ensure that Zimbabwe wouldn't become a safe haven for the ANC. He called for Western sanctions on South Africa, but obviously never thought to limit Zimbabwean trade with South Africa. He enjoyed being viewed by other black leaders as the principled anti-apartheid crusader, but he never actually acted like one.
Oh, and also I've just remembered, there was the historically beautiful irony that he was rolled out consistently in the early 90s to "reassure" white South Africans that black majority rule in South Africa would be good for them.