"You may succeed in silencing one man, but the howl of protest from around the world will reverberate, Mr Putin, in your ears for the rest of your life."
These are the words of Russian dissident Alexander Litvinenko, written from his hospital bed - days out from death after an excruciating month suffering from radioactive poisoning.
I’d guess you remember this certain chain of events with one image: the snapshot of a frail but defiant Litvinenko covered in wires, staring from his hospital bed. A small pool of blood beside him on his pillow.
20 years later, Putin is still president. Over a dozen Russia-linked deaths on British soil have been deemed suspicious. And Litvinenko’s wife, Marina, continues his howl of protest.
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