Security services have issued an unprecedented warning about a shadowy Russian military unit accused of carrying out assassinations and cyberattacks on the streets of Britain. So as the government ramps up its defence against the threat from the Kremlin, what exactly is Unit 29155? And why is it targeting the West?

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Guest: Fiona Hamilton, Chief Correspondent, The Times.

Host: Manveen Rana.

Producer: Edward Drummond.

Clips: Reuters, OnDemand News, Sky News, BBC News, Channel 4 News, RT, CBS News, Independent.

Photo: Getty Images/Times Illustration

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