Adoula returned to the Congo following Mobutu's seizure of power in November 1965. He was accommodating of Mobutu's new regime and served as the Congolese ambassador to the United States and Belgium. In 1969 he became Foreign Minister. He fell ill in May 1970. Mobutu took charge of the portfolio and Adoula retired from politics. In 1978 he suffered a heart attack and went to Lausanne, Switzerland for treatment. He succumbed to an illness and died there on 24 May 1978.
