In this photo taken Thursday, Feb. 26, 2015, a watchtower left over from the Cold War era is seen meters away from the Serbian border with Hungary close to Kelebija, 150 kilometers north of Belgrade, Serbia. (AP Photo/Marko Drobnjakovic)
In this photo taken Thursday, Feb. 26, 2015, a watchtower left over from the Cold War era is seen meters away from the Serbian border with Hungary close to Kelebija, 150 kilometers north of Belgrade, Serbia. (AP Photo/Marko Drobnjakovic)
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