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UN Secretary General Ban Ki-moon (C) and his wife Yoo Soon-taek (R), King Philippe of Belgium (2R, Queen Mathilde of Belgium(2L) and Belgium's Prime Minister Charles Michel (L) pose prior to a dinner at the Royal Palace in Brussels, on June 15, 2016. / AFP / THIERRY CHARLIER (Photo credit should read THIERRY CHARLIER/AFP/Getty Images)

UN Secretary General Ban Ki-moon (C) and his wife Yoo Soon-taek (R), King Philippe of Belgium (2R, Queen Mathilde of Belgium(2L) and Belgium's Prime Minister Charles Michel (L) pose prior to a dinner at the Royal Palace in Brussels, on June 15, 2016.  / AFP / THIERRY CHARLIER        (Photo credit should read THIERRY CHARLIER/AFP/Getty Images)