Balkan

Children from Syria play on truck trailers at the Athens' port of Piraeus where over 2,000 stranded refugees and migrants stay at the passenger terminal buildings and their tents, on Monday, March 7, 2016. European Union leaders will be looking to boost aid to Greece as the Balkan migrant route is effectively sealed, using Monday's summit as an attempt to restore unity among the 28 member nations after months of increasing bickering and go-it-alone policies. (AP Photo/Thanassis Stavrakis)

Thanassis Stavrakis/AP

Children from Syria play on truck trailers at the Athens’ port of Piraeus where over 2,000 stranded refugees and migrants stay at the passenger terminal buildings and their tents

A man sunbathes at Ada Ciganlija lake in Belgrade, Serbia, Thursday, June 20, 2013. The Balkan region is experiencing a heat wave, with temperatures rising as high as 37 degrees Celsius (99 Fahrenheit).

Marko Drobnjakovic/AP

A man sunbathes at Ada Ciganlija lake in Belgrade, Serbia. The Balkan region is experiencing a heat wave, with temperatures rising as high as 37 degrees Celsius (99 Fahrenheit).