Though the UN Charter had been written primarily to prevent aggression by one nation against another , in the early 1990s the UN faced a number of simultaneous , serious crises within nations such as Somalia , Haiti , Mozambique , and the former Yugoslavia . The UN mission in Somalia was widely viewed as a failure after the US withdrawal following casualties in the Battle of Mogadishu , and the UN mission to Bosnia faced " worldwide ridicule " for its indecisive and confused mission in the face of ethnic cleansing . In 1994 , the UN Assistance Mission for Rwanda failed to intervene in the Rwandan genocide amid indecision in the Security Council
Rwandan genocide
Rwandan genocide
United Nations