In just over a week, the U.S. has shot down four flying objects — one from China and three others of unknown origins. WSJ’s James T. Areddy on balloons, unidentified flying objects and the deterioration of relations between the two countries. Further Reading: -China’s Balloon Program Grew From a Humble Start -How a Balloon Opened a New Flashpoint in U.S.-China Ties -China Says U.S. Flew Balloons Through Its Airspace More Than 10 Times Further Listening: -China’s Accidental Dissidents Learn more about your ad choices. Visit megaphone.fm/adchoices