![Marko Drobnjakovic Ukraine's Foreign Minister Dmytro Kuleba, center, pauses before a meeting in Belgrade, Serbia, Monday, May 13, 2024. Kuleba, who has arrived on a surprise visit to Russia-friendly Serbia, held talks on Monday in Belgrade in a sign of warming relations between the two states. (AP Photo/Marko Drobnjakovic)](https://mapi.associatedpress.com/v2/items/5a4aef1904d94221866c1452b2f2663d/preview/preview.jpg?s=680x)
Ukraine's Foreign Minister Dmytro Kuleba, center, pauses before a meeting in Belgrade, Serbia, Monday, May 13, 2024. Kuleba, who has arrived on a surprise visit to Russia-friendly Serbia, held talks on Monday in Belgrade in a sign of warming relations between the two states. (AP Photo/Marko Drobnjakovic)
![Marko Drobnjakovic Serbian President Aleksandar Vucic, right, shakes hands with Ukraine's Foreign Minister Dmytro Kuleba, left, in Belgrade, Serbia, Monday, May 13, 2024. Kuleba, who has arrived on a surprise visit to Russia-friendly Serbia, held talks on Monday in Belgrade in a sign of warming relations between the two states. (AP Photo/Marko Drobnjakovic)](https://mapi.associatedpress.com/v2/items/797fdd086c8d4edaaf8d0f74d414a234/preview/preview.jpg?s=680x)
Serbian President Aleksandar Vucic, right, shakes hands with Ukraine's Foreign Minister Dmytro Kuleba, left, in Belgrade, Serbia, Monday, May 13, 2024. Kuleba, who has arrived on a surprise visit to Russia-friendly Serbia, held talks on Monday in Belgrade in a sign of warming relations between the two states. (AP Photo/Marko Drobnjakovic)
![Marko Drobnjakovic Ukraine's First Lady Olena Zelenska, left, is seen during a meeting with Serbian President Aleksandar Vucic, in Belgrade, Serbia, Monday, May 13, 2024. Zelenska, who has arrived together with Ukraine's Foreign Minister Dmytro Kuleba on a surprise visit to Russia-friendly Serbia, held talks on Monday in Belgrade in a sign of warming relations between the two states. (AP Photo/Marko Drobnjakovic)](https://mapi.associatedpress.com/v2/items/0bae6ff9c6cd4a7687072d5262528223/preview/preview.jpg?s=680x)
Ukraine's First Lady Olena Zelenska, left, is seen during a meeting with Serbian President Aleksandar Vucic, in Belgrade, Serbia, Monday, May 13, 2024. Zelenska, who has arrived together with Ukraine's Foreign Minister Dmytro Kuleba on a surprise visit to Russia-friendly Serbia, held talks on Monday in Belgrade in a sign of warming relations between the two states. (AP Photo/Marko Drobnjakovic)
![Marko Drobnjakovic Serbian President Aleksandar Vucic, right, gestures during his meeting with Ukraine's Foreign Minister Dmytro Kuleba, left, in Belgrade, Serbia, Monday, May 13, 2024. Kuleba, who has arrived on a surprise visit to Russia-friendly Serbia, held talks on Monday in Belgrade in a sign of warming relations between the two states. (AP Photo/Marko Drobnjakovic)](https://mapi.associatedpress.com/v2/items/ce53fff06a324755aa9ea1aa4385a50e/preview/preview.jpg?s=680x)
Serbian President Aleksandar Vucic, right, gestures during his meeting with Ukraine's Foreign Minister Dmytro Kuleba, left, in Belgrade, Serbia, Monday, May 13, 2024. Kuleba, who has arrived on a surprise visit to Russia-friendly Serbia, held talks on Monday in Belgrade in a sign of warming relations between the two states. (AP Photo/Marko Drobnjakovic)
![Marko Drobnjakovic Serbian Prime Minsiter Milos Vucevic, front right, shakes hands with Ukraine's Foreign Minister Dmytro Kuleba, front left, in Belgrade, Serbia, Monday, May 13, 2024. Kuleba, who has arrived on a surprise visit to Russia-friendly Serbia, held talks on Monday in Belgrade in a sign of warming relations between the two states. (AP Photo/Marko Drobnjakovic)](https://mapi.associatedpress.com/v2/items/337ad37f0b964898bdd5ba349b1b7ad7/preview/preview.jpg?s=680x)
Serbian Prime Minsiter Milos Vucevic, front right, shakes hands with Ukraine's Foreign Minister Dmytro Kuleba, front left, in Belgrade, Serbia, Monday, May 13, 2024. Kuleba, who has arrived on a surprise visit to Russia-friendly Serbia, held talks on Monday in Belgrade in a sign of warming relations between the two states. (AP Photo/Marko Drobnjakovic)