Grigor Atanesian from BBC Russian joins us to discuss the theories around 'grey zone' warfare techniques and if, why, and how Russia is deploying them against the UK. This episode of The Documentary comes to you from The Fifth Floor, the show at the heart of global storytelling, with BBC journalists from all around the world. Presented by Faranak Amidi Produced by Caroline Ferguson and Alice Gioia(Photo: Faranak Amidi. Credit: Tricia Yourkevich.)

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