Political map of Europe & the Mediterranean 12 June 1999 (Kosovo War): By 1995 atrocities (Ethnic cleansing in the Bosnian War) in the Bosnian War prompted NATO intervention against the Bosnian Serbs (Operation Deliberate Force) and the UN occupation of Bosnia-Herzegovina. Just a few years later, conflict broke out between ethnic Serbs and Albanians in Kosovo (Kosovo War) in the Yugoslav republic of Serbia itself. Again NATO intervened (1999 NATO bombing of the Federal Republic of Yugoslavia), forcing the Serbs to accept the UN administration of Kosovo.