BELGRADE, SERBIA - DECEMBER 12: Russian Foreign Minister Sergey Lavrov (L) meets Serbian Prime Minister Aleksandar Vucic (R) upon his arrival in Belgrade, Serbia on December 12, 2016. (Photo by Emre Bastug/Anadolu Agency/Getty Images)
BELGRADE, SERBIA - DECEMBER 12: Russian Foreign Minister Sergey Lavrov (L) meets Serbian Prime Minister Aleksandar Vucic (R) upon his arrival in Belgrade, Serbia on December 12, 2016. (Photo by Emre Bastug/Anadolu Agency/Getty Images)