Why is China sending ‘grandpa fighter jets’ to test Taiwan’s air defences?

The Chinese military’s use of ageing J-7 jets in a Taiwan fly-past last month has raised questions about why the second-generation fighters were deployed alongside more modern warplanes. Military sources raised the possibility that the planes had been converted into drones, which offer a cost-efficient way of honing the People’s Liberation Army’s combat drills and testing Taiwan’s response, and added they may also have been a way of testing whether all the island’s warplanes have resumed operati

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