The bulkan war occurred in the 1990s and the leader was Josip Broz Tito.
Slobodan Milošević was a Yugoslav and Serbian politician who was the President of Serbia, and he was accused for war crimes.
Yugoslavia broke up into many countries because of a series of political upheavals and conflicts during the early 1990s. After a period of political crisis in the 1980s, constituent republics of the Socialist Federal Republic of Yugoslavia split apart, but the unsolved issues caused bitter inter-ethnic Yugoslav wars.
Two things that might have started it is bitter ethnic relationships and rivalries during World War II, and the death of Tito.