Visiting German Chancellor Angela Merkel (2nd R, Front) inspects a guard of honor accompanied by Serbian President Aleksandar Vucic (1st R, Front) during a welcome ceremony in Belgrade, Serbia, on Sept. 13, 2021. (Photo by Predrag Milosavljevic/Xinhua)

Visiting German Chancellor Angela Merkel (L) and Serbian President Aleksandar Vucic attend a press conference after their meeting in Belgrade, Serbia, on Sept. 13, 2021. (Photo by Predrag Milosavljevic/Xinhua)

Visiting German Chancellor Angela Merkel (2nd L) and Serbian President Aleksandar Vucic (2nd R) attend a press conference after their meeting in Belgrade, Serbia, on Sept. 13, 2021. (Photo by Predrag Milosavljevic/Xinhua)

Visiting German Chancellor Angela Merkel (2nd R, Front) inspects a guard of honor accompanied by Serbian President Aleksandar Vucic (1st R, Front) during a welcome ceremony in Belgrade, Serbia, on Sept. 13, 2021. (Photo by Predrag Milosavljevic/Xinhua)