A suspected Chinese spy balloon and three unidentified flying objects were shot down over the U.S. and Canada in recent weeks. An aeronautics historian explains the history of spy balloons and why countries still use them today. Graphic: Miki Katoni
TAIPEI—Nearly a year after the appearance of a suspected Chinese spy balloon over the U.S. sent relations between Beijing and Washington into free fall, high-altitude balloons from China have again been spotted floating over sensitive territory.
This time, it is the main island of self-ruled Taiwan, which is days away from holding a presidential election with ramifications for the future of U.S.-China relations.
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