Workers hang on ropes to install a giant Chinese national flag on a skyscraper that is a symbolic gateway leading into the city from the airport, 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)