In this photo released by China's Xinhua News Agency, a worker in protective clothing handles COVID-19 test samples in Bayan County of Harbin city in northeastern China's Heilongjiang Province, Monday, September 27, 2021. A city in northern China has euthanized three housecats after they tested positive for COVID-19, according to a local media report. The authorities in Harbin said the action was taken because there was no course of treatment for animals with the disease and they would have endangered their owner and residents of the entire apartment complex in which they lived, the Beijing News online said. (Photo by Wang Jianwei/Xinhua via AP Photo)





An aerial view shows the construction site of Guangzhou Evergrande Soccer Stadium, a new stadium for Guangzhou FC, developed by China Evergrande Group, in Guangzhou, Guangdong province, China on September 26, 2021. (Photo by Thomas Suen/Reuters)





A man carrying an umbrella with the United States flag colors as he walks past the CH-6 drone during the 13th China International Aviation and Aerospace Exhibition, also known as Airshow China 2021 onTuesday, September 28, 2021, in Zhuhai in southern China's Guangdong province. A state-owned Chinese aerospace company unveiled the military drone it says can stay aloft for up to 20 hours at altitudes as high as 15,000 meters (50,000 feet) at the opening Monday of the country's biggest air show. (Photo by Ng Han Guan/AP Photo)





An AG600 drops a payload of water during a performance for the 13th China International Aviation and Aerospace Exhibition, also known as Airshow China 2021, on Tuesday, September 28, 2021 in Zhuhai in southern China's Guangdong province. (Photo by Ng Han Guan/AP Photo)





A CH-4 long endurance drone is displayed at the China International Aviation and Aerospace Exhibition, or Airshow China, in Zhuhai, Guangdong province, China on September 28, 2021. (Photo by Aly Song/Reuters)





Members of the “August 1st” Aerobatic Team of the Chinese People's Liberation Army (PLA) Air Force perform during the 13th China International Aviation and Aerospace Exhibition, also known as Airshow China 2021, on Tuesday, September 28, 2021, in Zhuhai in southern China's Guangdong province. (Photo by Ng Han Guan/AP Photo)





A WZ-8 high-altitude drone is seen displayed at the China International Aviation and Aerospace Exhibition, or Airshow China, in Zhuhai, Guangdong province, China on September 28, 2021. (Photo by Aly Song/Reuters)





A member of the “August 1st” Aerobatic Team of the Chinese People's Liberation Army (PLA) Air Force performs during the 13th China International Aviation and Aerospace Exhibition on Wednesday, September 29, 2021, in Zhuhai in southern China's Guangdong province. (Photo by Ng Han Guan/AP Photo)





A visitor watches aviation performances during 13th China International Aviation and Aerospace Exhibition on Wednesday, September 29, 2021, in Zhuhai in southern China's Guangdong province. The ruling Communist Party is pouring billions of dollars into developing fighter jets, stealth technology, drones and other hardware for its military wing, the People's Liberation Army, as it presses claims to disputed seas and other territory. (Photo by Ng Han Guan/AP Photo)





Members of the “August 1st” Aerobatic Team of the Chinese People's Liberation Army (PLA) Air Force perform near a J-16D electronic warfare airplane during the 13th China International Aviation and Aerospace Exhibition, also known as Airshow China 2021, on Wednesday, September 29, 2021, in Zhuhai in southern China's Guangdong province. (Photo by Ng Han Guan/AP Photo)





Ground crew cover a jet from the "August 1st" Aerobatic Team of the Chinese People's Liberation Army (PLA) Air Force after a performance during the 13th China International Aviation and Aerospace Exhibition, also known as Airshow China 2021, on Tuesday, September 28, 2021, in Zhuhai in southern China's Guangdong province. (Photo by Ng Han Guan/AP Photo)





Members of the “August 1st” Aerobatic Team of the Chinese People's Liberation Army (PLA) Air Force perform during the 13th China International Aviation and Aerospace Exhibition on Wednesday, September 29, 2021, in Zhuhai in southern China's Guangdong province. (Photo by Ng Han Guan/AP Photo)





A military guide briefs invited guests on details of the Chinese People's Liberation Army (PLA) Air Force's large transport aircraft the Y-20A during 13th China International Aviation and Aerospace Exhibition, also known as Airshow China 2021, on Wednesday, September 29, 2021, in Zhuhai in southern China's Guangdong province. (Photo by Ng Han Guan/AP Photo)





Visitors take photos of a Chinese military attack helicopter displayed during 13th China International Aviation and Aerospace Exhibition on Wednesday, September 29, 2021, in Zhuhai in southern China's Guangdong province. (Photo by Ng Han Guan/AP Photo)





A woman walks past a floral installation set up ahead of the China's National Day, which marks the 72nd anniversary of the founding of People's Republic of China, in Beijing, China on September 28, 2021. (Photo by Tingshu Wang/Reuters)





A woman wears a virtual reality headset as she takes a simulated bobsleigh ride at a booth for Chinese telecom provider China Unicom at the PT Expo in Beijing, Tuesday, September 28, 2021. The annual expo showcases Chinese and foreign telecommunications firms. (Photo by Mark Schiefelbein/AP Photo)





Chinese President Xi Jinping walks past wreaths of flowers and a member of an honor guard after he paid respect to the Monument to the People's Heroes during a ceremony to mark Martyr's Day at Tiananmen Square in Beijing, Thursday, September 30, 2021. (Photo by Andy Wong/AP Photo)





A female military officer wearing a face mask to help protect from the coronavirus looks at a female honor guard stands on Tiananmen Square during a ceremony to mark Martyr's Day in Beijing, Thursday, September 30, 2021. (Photo by Andy Wong/AP Photo)





A man uses his smartphone flashlight to light up his bowl of noodles as he eats his breakfast at a restaurant during a blackout in Shenyang in northeastern China's Liaoning Province, Wednesday, September 29, 2021. People ate breakfast by flashlight and shopkeepers used portable generators Wednesday as power cuts imposed to meet official conservation goals disrupted manufacturing and daily life. (Photo by Olivia Zhang/AP Photo)





Bicycle rickshaw drivers chat as they wait for customers near the Drum Tower in a traditional neighbourhood on September 30, 2021 in Beijing, China. China will mark National Day and the Golden Week holiday from October 1st. (Photo by Kevin Frayer/Getty Images)