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BELGRADE, SERBIA - APRIL 8: People march during a protest against Serbian Prime Minister Aleksandar Vucic's presidential win in the country's presidential election in Belgrade, Serbia on April 8, 2017. Serbia's conservative Prime Minister Aleksandar Vucic on Sunday declared victory in the presidential elections. (Photo by Talha Ozturk/Anadolu Agency/Getty Images)

BELGRADE, SERBIA - APRIL 8: People march during a protest against Serbian Prime Minister Aleksandar Vucic's presidential win in the country's presidential election in Belgrade, Serbia on April 8, 2017. Serbia's conservative Prime Minister Aleksandar Vucic on Sunday declared victory in the presidential elections. (Photo by Talha Ozturk/Anadolu Agency/Getty Images)