In this photo taken on Sept. 9, 2018, soldiers of NATO-led peacekeeping force KFOR take a break by the side of the road in the village of Kosterc, Kosovo. Serbia's prime minister warned on Wednesday that the formation of a Kosovo army could trigger Serbia's armed intervention in the former province — the bluntest warning so far amid escalating tensions in the Balkans. (AP Photo/Visar Kryeziu)
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