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Kosovo War

Inter-ethnic tensions continued to worsen in Kosovo throughout the 1980s. In 1989, Serbian President Slobodan Milošević, employing a mix of intimidation and political maneuvering, drastically reduced Kosovo's special autonomous status within Serbia and started cultural oppression of the ethnic Albanian population. Kosovar Albanians responded with a non-violent separatist movement, employing widespread civil disobedience and creation of parallel structures in education, medical care, and taxation, with the ultimate goal of achieving the independence of Kosovo.

In July 1990, the Kosovo Albanians proclaimed the existence of the Republic of Kosova, and declared it a sovereign and independent state in September 1992. In May 1992, Ibrahim Rugova was elected its president. During its lifetime, the Republic of Kosova was only officially recognised by Albania. By the mid-1990s, the Kosovo Albanian population was growing restless, as the status of Kosovo was not resolved as part of the Dayton Agreement of November 1995, which ended the Bosnian War. By 1996, the Kosovo Liberation Army (KLA), an ethnic Albanian guerrilla paramilitary group that sought the separation of Kosovo and the eventual creation of a Greater Albania, had prevailed over the Rugova's non-violent resistance movement and launched attacks against the Yugoslav Army and Serbian police in Kosovo, resulting in the Kosovo War.

By 1998, international pressure compelled Yugoslavia to sign a ceasefire and partially withdraw its security forces. Events were to be monitored by Organization for Security and Co-operation in Europe (OSCE) observers according to an agreement negotiated by Richard Holbrooke. The ceasefire did not hold and fighting resumed in December 1998, culminating in the Račak massacre, which attracted further international attention to the conflict. Within weeks, a multilateral international conference was convened and by March had prepared a draft agreement known as the Rambouillet Accords, calling for the restoration of Kosovo's autonomy and the deployment of NATO peacekeeping forces. The Yugoslav delegation found the terms unacceptable and refused to sign the draft. Between 24 March and 10 June 1999, NATO intervened by bombing Yugoslavia, aiming to force Milošević to withdraw his forces from Kosovo, though NATO could not appeal to any particular motion of the Security Council of the United Nations to help legitimise its intervention. Combined with continued skirmishes between Albanian guerrillas and Yugoslav forces the conflict resulted in a further massive displacement of population in Kosovo.

During the conflict, between 848,000-863,000 ethnic Albanians fled or were forcefully driven from Kosovo and an additional 590,000 were internally displaced. Some sources claim that this ethnic cleansing of native Albanians was part of a plan known as Operation Horseshoe, also referred to as "Milosevic's final solution to the Kosovo problem." Although the existence and implementation of this operation have not yet been proven, it closely describes the situation with the victims and refugees in neighboring countries.

In 1999 more than 11,000 deaths were reported to the office of the International Criminal Tribunal for the former Yugoslavia prosecutor Carla Del Ponte. As of 2010, some 3,000 people were still missing, including 2,500 Albanians, 400 Serbs and 100 Roma. By June, Milošević agreed to a foreign military presence in Kosovo and the withdrawal of his troops. During the Kosovo War, over 90,000 Serbian and other non-Albanian refugees fled the province. In the days after the Yugoslav Army withdrew, over 80,000 Serb and other non-Albanian civilians (almost half of 200,000 estimated to live in Kosovo) were expelled from Kosovo, and many of the remaining civilians were victims of abuse. After the Kosovo and other Yugoslav Wars, Serbia became home to the highest number of refugees and IDPs (including Kosovo Serbs) in Europe.

In some villages under Albanian control in 1998, militants drove ethnic Serbs from their homes. Some of those who remained are unaccounted for and are presumed to have been abducted by the KLA and killed. The KLA detained an estimated 85 Serbs during its 19 July 1998 attack on Rahovec. 35 of these were subsequently released but the others remained. On 22 July 1998, the KLA briefly took control of the Belaćevac mine near the town of Obiliq. Nine Serb mineworkers were captured that day and they remain on the International Committee of the Red Cross 's list of the missing and are presumed to have been killed. In August 1998, 22 Serbian civilians were reportedly killed in the village of Klečka, where the police claimed to have discovered human remains and a kiln used to cremate the bodies. In September 1998, Serbian police collected 34 bodies of people believed to have been seized and murdered by the KLA, among them some ethnic Albanians, at Lake Radonjić near Glođane (Gllogjan) in what became known as the Lake Radonjić massacre. Human Rights Watch have raised questions about the validity of at least some of these allegations made by Serbian authorities.

The International Criminal Tribunal for the former Yugoslavia (ICTY) prosecuted crimes committed during the Kosovo War. Nine senior Yugoslav officials, including Milošević, were indicted for crimes against humanity and war crimes committed between January and June 1999. Six of the defendants were convicted, one was acquitted, one died before his trial could commence, and one (Milošević) died before his trial could conclude. Six KLA members were charged with crimes against humanity and war crimes by the ICTY following the war, and one was convicted.

In total around 10,317 civilians were killed during the war, of whom 8,676 were Albanians, 1,196 Serbs and 445 Roma and others in addition to 3,218 killed members of armed formations.