He was Minister of Foreign Affairs from 1976 to 1982 and again from 1984 to 1986, and he was later the Permanent Representative to the United Nations on several occasions.
Ia adalah Menteri Luar Negeri periode 1976−1982 dan lagi periode 1984−1986, dan ia kemudian menjadi Perwakilan Tetap untuk PBB pada beberapa kesempatan.