Visitors from China take a bow in front of a black-marble monument and to lay flowers in honor of the victims of the 1999 bombing, in Belgrade, Serbia, Saturday, May 4, 2024. Chinese leader Xi Jinping's visit to European ally Serbia on Tuesday falls on a symbolic date: the 25th anniversary of the bombing of the Chinese Embassy in Belgrade during NATO's air war over Kosovo. (AP Photo/Darko Vojinovic)