After presidential elections in September 2000 , opposition parties accused Milošević of electoral fraud . A campaign of civil resistance followed , led by the Democratic Opposition of Serbia ( DOS ) , a broad coalition of anti-Milošević parties . This culminated on 5 October when half a million people from all over the country congregated in Belgrade , compelling Milošević to concede defeat . The fall of Milošević ended Yugoslavia 's international isolation . Milošević was sent to the International Criminal Tribunal for the former Yugoslavia . The DOS announced that FR Yugoslavia would seek to join the European Union . In 2003 , the Federal Republic of Yugoslavia was renamed Serbia and Montenegro ; the EU opened negotiations with the country for the Stabilisation and Association Agreement . Serbia 's political climate remained tense and in 2003 , the Prime Minister Zoran Đinđić was assassinated as result of a plot originating from circles of organised crime and former security officials
assassinated
Assassination of Zoran Đinđić
Serbia