 Following the conclusion of the Paris Agreements in October 1991, he was involved in the preparations for the establishment of the United Nations Transitional Authority in Cambodia (UNTAC).Annabi joined the Department of Peacekeeping Operations (DPKO) in 1992 and served as Director of the Africa Division from 1993 to 1996.In addition, he was designated as Officer-in-Charge of the Office of Operations of DPKO in June 1996.