EXPLAINER: Halfway through Olympics, what’s happened so far?


              Kamila Valieva, of the Russian Olympic Committee, trains at the 2022 Winter Olympics, Sunday, Feb. 13, 2022, in Beijing. (AP Photo/Natacha Pisarenko)
            
              A police officer guards next to a fence surrounding an Olympic hotel at the 2022 Winter Olympics, Tuesday, Feb. 8, 2022, in the Yanqing district of Beijing. (AP Photo/Pavel Golovkin)
            
              The National Stadium known as the Bird's Nest, seen fenced in from the bus, inside the bubble created for the 2022 Winter Olympics, Saturday, Feb. 12, 2022, in Beijing. (AP Photo/Nariman El-Mofty)
            
              Nathan Chen, of the United States, competes in the men's free skate program during the figure skating event at the 2022 Winter Olympics, Thursday, Feb. 10, 2022, in Beijing. (AP Photo/Jeff Roberson)
            
              Eileen Gu, of China, competes during the women's freestyle skiing big air finals of the 2022 Winter Olympics, Tuesday, Feb. 8, 2022, in Beijing. (AP Photo/Jae C. Hong)
            
              A worker prepares to administer a COVID-19 test at the 2022 Winter Olympics, Tuesday, Feb. 1, 2022, in Beijing. (AP Photo/David J. Phillip)