FILE- Serbian Prime Minister Aleksandar Vucic, left, and Chinese President Xi Jinping pose for photographers as they meet at the Great Hall of the People in Beijing Tuesday, May 16, 2017. The two countries have a long history of friendship, particularly since 1999, when NATO bombed the Chinese embassy in Belgrade, killing three Chinese nationals, during the air war to end Serbia's brutal crackdown on ethnic Albanian separatists in Kosovo. (Damir Sagolj/Pool Photo via AP)