The U.N.'s peacekeeping mission in Western Sahara has ended after 35 years due to a U.S.-Russia standoff. The mission's conclusion raises concerns about regional stability. Morocco claims the mineral-rich territory, while the pro-independence Polisario Front, backed by Algeria, seeks independence. Russia vetoed a U.S. resolution supporting Morocco's sovereignty, leading to the mission's abrupt end. Morocco welcomed the decision, while the Polisario Front called it unacceptable. The U.N. established the mission in 1991 to monitor a ceasefire and plan a referendum, which never occurred. The region remains tense, with potential for escalating hostilities.