Balloons in Warfare: From Japanese Bomb Balloons to Chinese Spy Balloons

China's spy balloon: inflatable eyes in the sky have been used in war for centuries

When Japan Launched Killer Balloons in World War II

Chinese spy balloon flew near Iowa as it traversed the United States

Chinese spy balloon sparks memories of Japanese balloon bombs during WWII

U.S. downs Chinese balloon over ocean, moves to recover debris - Los Angeles Times

China Says U.S. Flew High-altitude Balloons Over Its Airspace - The Japan News

China balloon: Many questions about suspected spy in the sky

China's spy balloon: inflatable eyes in the sky have been used in war for centuries

Site of a Japanese Balloon Bomb Explosion – Omaha, Nebraska - Atlas Obscura

U.S. shoots down Chinese spy balloon over Atlantic Ocean - Nikkei Asia

New images show Chinese spy balloons over Asia - BBC News