China on Monday said more than 10 U.S. high-altitude balloons have flown in its airspace during the past year without its permission, following Washington's accusation that Beijing operates a fleet of surveillance balloons around the world. The Chinese allegation comes after the U.S. shot down a suspected Chinese spy balloon that had crossed from Alaska to South Carolina, sparking a new crisis in bilateral relations that have spiraled to their lowest level in decades. Foreign Ministry spokesperson Wang Wenbin gave no details about the alleged U.S. balloons, how they had been dealt with or...