A Russian frigate fired warning shots at a British-flagged yacht in the English Channel on Tuesday, an incident the Ministry of Defence is now investigating. The encounter, which occurred 20 nautical miles south of the Isle of Wight, has heightened tensions and raised immediate questions about proportionality and maritime law.

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• Russian frigate warning shots: The MoD is probing the incident involving the Admiral Grigorovich and a UK yacht, which the Russian...