The Defence Secretary Interview: The Covert Russian Submarine Operation

Today, the defence secretary has revealed the British military has responded to a month-long Russian submarine operation over cables and pipelines north of UK.

John Healey says he deployed a warship and aircraft in response, and the Russian vessels were "monitored 24/7". He says there is "no evidence" of any damage to UK infrastructure in the Atlantic.

Why are the cables so important? What was Russia trying to achieve? Are the UK able to stop them from doing this again in future? Adam is joined by the Defence Secretary John Healey.

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