US-China spy balloon row: surveillance device or weather airship?

At first the Chinese refused to admit the balloon was theirs, then they said it was a meteorological airship that had blown off course.

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The Americans say it's for spying.

Whatever it is, it's making its way across North America and leaving diplomatic drama in its wake.

Secretary of State Antony Blinken has postponed a trip to Beijing whilst Chinese state media has made barbed remarks about the weakness of the US's air defences.

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