Ukraine's President Volodymyr Zelenskyy, left, shakes hands with his Serbian counterpart Aleksandar Vucic after a welcome ceremony at the Serbia Palace, in Belgrade, Serbia, Saturday, Aug. 8, 2026. (AP Photo/Darko Vojinovic)

Ukraine's President Volodymyr Zelenskyy stands with his Serbian counterpart Aleksandar Vucic during a welcome ceremony at the Serbia Palace, in Belgrade, Serbia, Saturday, Aug. 8, 2026. (AP Photo/Darko Vojinovic)

Ukraine's President Volodymyr Zelenskyy reviews an honor guard with his Serbian counterpart Aleksandar Vucic during a welcome ceremony at the Serbia Palace, in Belgrade, Serbia, Saturday, Aug. 8, 2026. (AP Photo/Darko Vojinovic)

Ukraine's President Volodymyr Zelenskyy arrives for joint press statements with his Serbian counterpart Aleksandar Vucic at the Serbia Palace, in Belgrade, Serbia, Saturday, Aug. 8, 2026. (AP Photo/Darko Vojinovic)

Ukraine's President Volodymyr Zelenskyy stands with his Serbian counterpart Aleksandar Vucic during a welcome ceremony at the Serbia Palace, in Belgrade, Serbia, Saturday, Aug. 8, 2026. (AP Photo/Darko Vojinovic)

Serbian President Aleksandar Vucic adjusts his headphones during a press conference with Ukraine's President Volodymyr Zelenskyy at the Serbia Palace, in Belgrade, Serbia, Saturday, Aug. 8, 2026. (AP Photo/Darko Vojinovic)

Ukraine's President Volodymyr Zelenskyy grimaces during a press conference with his Serbian counterpart Aleksandar Vucic at the Serbia Palace, in Belgrade, Serbia, Saturday, Aug. 8, 2026. (AP Photo/Darko Vojinovic)

Ukraine's President Volodymyr Zelenskyy speaks during a press conference with his Serbian counterpart Aleksandar Vucic at the Serbia Palace, in Belgrade, Serbia, Saturday, Aug. 8, 2026. (AP Photo/Darko Vojinovic)