In this photo taken Wednesday, April 6, 2016, a pilot stands by a MiG 29 fighter jet at the Batajnica military airport outside Belgrade, Serbia. Serbia's defense minister Zoran Djordjevic said Sunday, March 12, 2017, that the country is expecting Russian President Vladimir Putin's approval for the delivery of fighter jets, which could worsen tensions with neighboring states. (AP Photo/Darko Vojinovic)
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