Defence Secretary John Healey has revealed that the UK and its allies monitored a Russian attack submarine and two spy submarines mapping Britain’s underwater infrastructure.

The operation occurred in UK economic waters in the North Atlantic and lasted a month.

Sky’s defence and security editor, Deborah Haynes, said Mr Healey’s public comments were aimed at deterring further Russian operations.

Live updates: https://news.sky.com/story/politics-latest-wes-streeting-doctors-strike-labour-keir-starmer-iran-war-12593360

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