Serbian and Chinese security forces perform during a joint anti-terrorist drill in the Zelezara Smederevo steel mill, in the city of Smederevo, 45 kilometers east of Belgrade, Serbia, Thursday, Nov. 28, 2019. Serbian and Chinese security forces are holding a joint anti-terrorist drills in the Balkan country in a sign of Beijing’s increasing influence in the volatile region. (AP Photo/Darko Vojinovic)