Aleksandar Vucic

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Serbia's newly re-elected President Aleksandar Vucic takes oath for a new term of office during an inauguration ceremony, in Belgrade, Serbia, Wednesday, May 31, 2017. Vucic has been sworn in as Serbia's president, telling his supporters that he will work on peace and stability in the Balkans. (AP Photo/Darko Vojinovic)

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Serbia's newly re-elected President Aleksandar Vucic, right, takes oath for a new term of office during an inauguration ceremony, in Belgrade, Serbia, Wednesday, May 31, 2017. Vucic has been sworn in as Serbia's president, telling his supporters that he will work on peace and stability in the Balkans. (AP Photo/Darko Vojinovic)

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Serbia's newly re-elected President Aleksandar Vucic blows a kiss during an inauguration ceremony, in Belgrade, Serbia, Wednesday, May 31, 2017. Vucic has been sworn in as Serbia's president, telling his supporters that he will work on peace and stability in the Balkans. (AP Photo/Darko Vojinovic)

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Serbia's newly elected President Aleksandar Vucic stands in Parliament building during an inauguration ceremony, in Belgrade, Serbia, Wednesday, May 31, 2017. Vucic has been sworn in as Serbia's president, telling his supporters that he will work on peace and stability in the Balkans.(AP Photo/Darko Vojinovic)

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Serbia's President Aleksandar Vucic waves during an inauguration ceremony, in Belgrade, Serbia, Wednesday, May 31, 2017. Vucic has been sworn in as Serbia's president, telling his supporters that he will work on peace and stability in the Balkans.(AP Photo/Darko Vojinovic)