Serbian President Aleksandar Vucic walks by a MiG-29 jet fighter on the tarmac at Batajnica, military airport near Belgrade, Serbia, Tuesday, Aug. 21, 2018. Serbia's air force has taken the delivery of two Russian MiG-29 fighter jets, part of an arms purchase that has the potential to heighten tensions in the Balkans and increase Moscow's influence in the region. (AP Photo/Darko Vojinovic)
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