In this photo taken Friday, Oct. 20, 2017, a Serbian Army MiG-29 jet fighter performs during ceremony in Batajnica, military airport near Belgrade, Serbia. Serbia's defense minister Aleksandar Vulin says the country is negotiating the purchase of Russian military helicopters and other equipment that has the potential to heighten tensions in the war-weary Balkans and increase Moscow's influence in the region. In October, the Serbian air force received six MiG-29 fighter jets from Russia, which has also promised the delivery of 30 tanks. (AP Photo/Darko Vojinovic)
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