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Three Russian submarines carried out a "covert" operation over cables and pipelines in waters north of the UK. The Defence Secretary John Healey said yesterday the UK and its allies tracked a Russian attack submarine and two spy submarines for a month, before they retreated. The head of the Royal Navy General Sir Gwyn Jenkins says Russia is "still building more submarines so the threat isn't diminishing, it's growing". So how vulnerable is the UK in the modern world? Do we need to bolster our military to keep us safe? Tony Livesey sitting in for Nicky Campbell asked listeners: Could Russia cut us off?