Kosovo War

Former Kosovo Prime Minister Ramush Haradinaj arrives for a Kosovo tribunal, at the Hague, Netherlands, Wednesday, July 24, 2019. Haradinaj will be questioned by a special court investigating alleged war crimes by members of the separatist Kosovo Liberation Army two decades ago. (AP Photo/Michael Corder)

FILE - In this Sunday, June 11, 2017 file photo, Ramush Haradinaj, candidate for Prime Minister, casts his ballot during the early parliamentary elections Pristina, Kosovo. Kosovo’s prime minister has resigned from the post after he has been invited to be questioned from a European Union-funded court investigating crimes against ethnic Serbs during and after the 1998-99 independence war with Serbia. Haradinaj said on Friday, July 19, 2019 he had informed the Cabinet of his resignation and urged the country’s president to set a date for an early parliamentary election. (AP Photo/Visar Kryeziu, file)

FILE - In this Friday, Dec. 3, 2004 file photo, Ramush Haradinaj, right, former rebel commander elected Kosovo's Prime Minister, listens during the inaugural session of Kosovo's parliament in Kosovo's capital Pristina. Kosovo’s prime minister has resigned from the post after he has been invited to be questioned from a European Union-funded court investigating crimes against ethnic Serbs during and after the 1998-99 independence war with Serbia. Haradinaj said on Friday, July 19, 2019 he had informed the Cabinet of his resignation and urged the country’s president to set a date for an early parliamentary election. (AP Photo / Visar Kryeziu)

Former U.S. President Bill Clinton speaks during anniversary celebrations in the capital Pristina, Kosovo, Wednesday, June 12, 2019. Exactly 20 years ago, NATO forces set foot in the former Yugoslav province _ revered by Serbs as their historic and religious heartland _ after an allied bombing campaign ended Serbia's bloody crackdown on an insurrection by Kosovo's majority ethnic Albanian population. (AP Photo/Visar Kryeziu)

Kosovo police special unit members secure the area near the village of Cabra, north western Kosovo, during an ongoing police operation on Tuesday, May 28, 2019. A Kosovo police operation against organized crime in the north, where most of the ethnic Serb minority lives, has sparked tension, and Serbia ordered its troops to full alert. (AP Photo/Visar Kryeziu)

Kosovo police special unit members secure the area near the village of Cabra, north western Kosovo, during an ongoing police operation on Tuesday, May 28, 2019. A Kosovo police operation against organized crime in the north, where most of the ethnic Serb minority lives, has sparked tension, and Serbia ordered its troops to full alert. (AP Photo/Visar Kryeziu)

Vojislav Seselj, center, the leader of the ultranationalist Serbian Radical Party, holds a burning NATO flag as he and others gather for a protest in Belgrade, Serbia, Sunday, March 24, 2019. Members of the ultranationalist Serbian Radical Party gathered for a protest on Sunday in the Serbian capital to mark the 20th anniversary of the NATO led bombing campaign against Serbia in 1999. (AP Photo/Marko Drobnjakovic)

In this Nov. 17, 2017, photo, Serbia's President Aleksandar Vucic, right, reviews an honor guard with his Defense Minister Aleksandar Vulin during a bilateral Serbian and U.S. airborne exercise at Lisicji jarak airport, some 15 kilometers (10 miles) north of Belgrade, Serbia. A U.S. envoy urged Serbia and Kosovo on Friday, March 8, 2019 to stop mutual provocations and resume dialogue amid rising tensions between the two wartime foes. (AP Photo/Darko Vojinovic)