FILE - Hungarian Prime Minister Viktor Orban shakes hands with Chinese President Xi Jinping during a meeting on April 25, 2019, as part of the second Belt and Road Forum in Beijing. Xi will visit Hungary this week on his European tour. FILE - Serbian Prime Minister Aleksandar Vucic, center, adjusts an earphone as he attends a meeting with Chinese President Xi Jinping at the Great Hall of the People in Beijing, May 16, 2017. Xi will visit Serbia this week on his European tour.