The United Nations Observer Mission in Liberia (UNOMIL) was established on 22 September 1993 by Security Council Resolution 866 (1993). Its purpose was to support the Economic Community of West African States (ECOWAS) in its efforts to end a civil war that had broken out in late 1989 by implementing, and impartially enforcing compliance with, the Cotonou Peace Agreement signed 23 July 1993. UNOMIL coordinated with the Economic Community of West African States Monitoring Group (ECOMOG), the peacekeeping force of ECOWAS, and an agreement defining the relationship between UNOMIL and ECOMOG was finalized in November 1993.
UNOMIL, under the command of the Secretary-General, was led in the field by the Special Representative of the Secretary-General (SRSG) to Liberia. Serving as SRSG to Liberia were: Trevor Livingston Gordon-Somers of Jamaica (November 1992 – December 1994); Anthony Nyakyi of the United Republic of Tanzania (December 1994 - April 1997); and Tuliameni Kalomoh of Namibia (April – September 1997).
UNOMIL was headquartered in Monrovia, Liberia, and was composed of military and civilian components. Command of the military component was entrusted to the Chief Military Observer (CMO), who reported to the Secretary-General through the Special Representative. The military component of UNOMIL monitored and verified compliance with the ceasefire, the embargo on delivery of arms and military equipment, as well as the cantonment, disarmament and demobilization of combatants. The civilian component included political, humanitarian, and electoral personnel. The electoral assistance element observed and verified the general and presidential elections, from the registration of voters to the voting itself. The elections were originally scheduled for February and March of 1994, but were delayed by outbreaks of fighting and political disputes; the elections were eventually held on 19 July 1997. The inauguration of the new Government took place on 2 August 1997.
UNOMIL was the first United Nations peacekeeping mission undertaken in cooperation with an active peacekeeping operation set up by a regional organization.
UNOMIL terminated on 30 September 1997.