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Masked protesters burn a Kosovo flag during a march in Belgrade, Serbia, Monday, Dec. 12, 2022. Tensions continued to be high in northern Kosovo on Monday, with Serbs blocking roads and Serbian President Aleksandar Vucic saying he would ask the NATO-led peacekeeping force in Kosovo to permit the deployment of 1,000 Serb troops in the Serb-populated north of Kosovo, saying they are being harassed there. (AP Photo/Milos Miskov)