Serbian President Aleksandar Vucic speaks during a news conference with Slovakia's Prime Minister Robert Fico in the Serbia Palace in Belgrade, Serbia, Thursday, Nov. 21, 2024. (AP Photo/Darko Vojinovic)

A woman holds a banner that shows Serbian President Aleksandar Vucic, reading: "You have blood on your hands!" and stopping traffic, standing in silence to commemorate the 15 victims of a railway roof collapse five weeks ago, demanding accountability for the tragedy in Belgrade, Serbia, Friday, Dec. 6, 2024. (AP Photo/Darko Vojinovic)

German Chancellor Olaf Scholz, center left, and Aleksandar Vucic, center right, President of Serbia, pose for a photo during their meeting in Freiberg, Germany, Tuesday, Dec. 10, 2024. (Sebastian Kahnert/DPA via AP, Pool)