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Kyiv accuses father and son of trying to give classified documents about its Neptune missile system to Chinese intelligence

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Ukrainian authorities say they have detained a Chinese father and son on charges of spying on its Neptune anti-ship missile programme at a time when Kyiv is seeking to boost its domestic arms industry to counter Russian advances.

Neptune, a key component of Ukraine's naval warfare capabilities, was used to destroy the flagship of the Russian Black Sea Fleet in the early months of the war. It has since been used on a range of targets including oil terminals.