Let me remind everyone: Serbs made an unsuccessful attempt to exterminate Muslim Kosovars from Kosovo in 1999. If it wasn’t for US and NATO, they would have been successful. As far as civilized world is concerned, whatever claim Yugoslavia (Serbia) had to Kosovo, they forfeited it the day they started mass-murder, mass-rape, and mass-expulsion of human beings in Kosovo who were Albanian.
Quoted from “War Crimes in Kosovo” Human Rights Watch report:
On March 24, 1999, the eyes of the world turned to Kosovo as aircraft from the North Atlantic Treaty Organization began to bomb targets in the Federal Republic of Yugoslavia. The start of NATO’s air war against Yugoslavia was also the beginning of the bloodiest period in Kosovo since the end of the Second World War. In the twelve weeks that followed, Serbian and Yugoslav military, police, and paramilitaries expelled more than 850,000 ethnic Albanians from Kosovo, internally displacing several hundred thousand more.1 Many were robbed and beaten as they were forced from their homes, which were frequently looted and burned. Scores of women were raped. Thousands of adult males were detained, and many of them were executed, in some cases together with women, children, and the elderly, although the total number of civilians executed is still unclear (see section on Death Toll below). In more than a dozen mass killing sites, government forces tried to hide the evidence by destroying or removing bodies. The brutal campaign against ethnic Albanian civilians came to a halt only after the withdrawal of Yugoslav soldiers and Serbian police and paramilitaries and the entry of NATO forces on June 12, 1999.