The United Nations Truce Supervision Organization (UNTSO) became the first UN Peacekeeping in May 1948, tasked with mediating conflict between Israel and its neighbors both during and after the 1948 Arab-Israeli war. This work is carried out over five countries — Egypt, Israel, Jordan, Lebanon, and Syria. Since then, UNTSO military observers remain in the Middle East to monitor ceasefires, supervise armistice agreements, prevent isolated incidents from escalating and assist other United Nations peacekeeping operations in the region, including in the Golan Heights (UNDOF) and Lebanon (UNIFIL).
UNTSO’s mandate is open-ended and does not require continuous renewal.