A police officer wearing a face mask and goggles to protect against COVID-19, stands near a poster of a skier on the wall at a train station in Zhangjiakou in northern China's Hebei Province, Friday, Nov. 26, 2021. Zhangjiakou will host the FIS Ski Cross and Snowboard Cross World Cups this weekend as part of a series of test events leading up to the 2022 Winter Olympics. (AP Photo/Mark Schiefelbein)

FILE - A police officer wearing a face mask and goggles to protect against COVID-19, stands near a poster of a skier on the wall at a train station in Zhangjiakou in northern China's Hebei Province, Friday, Nov. 26, 2021. China is threatening to take “firm countermeasures" if the U.S. proceeds with a diplomatic boycott of February's Beijing Winter Olympic Games. Foreign Ministry spokesperson Zhao Lijian on Monday accused U.S. politicians of grandstanding over the issue of not sending dignitaries to attend the events that China hopes will showcase its economic development. (AP Photo/Mark Schiefelbein, File)