As President Putin repeats his assertion that Ukraine and the West are behind the terrorist attack last week that killed 137 Russians, the evidence is only growing that this was the work of ISIS. The culprits come from a faction that have risen out of the ashes of the former ISIS Caliphate: ISIS-K. So who are they? And how worried should the rest of the world be?

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Guest: Mark Galeotti, historian, journalist and author of ‘We Need to Talk About Putin,’ ‘Putin’s Wars’ and ‘A Short History of Russia.’

Host: Manveen Rana.

Clips: Telegraph, PBS Newshour.

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