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US-China balloon row: Breaking down centuries-old spying technology This week, tensions between the US and China spiked further after an alleged spy balloon was shot down by Washington. Beijing later said it would firmly defend its interests after President Joe Biden vowed to protect the sovereignty of the United States. China continues to insist the balloon was for civilian purposes and had veered off course. FRANCE 24's Science Editor Shirli Sitbon explains why this spying technology is in fact nothing new.