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I would wonder whether the motive for the crime could be to extort something out of Putin or get revenge on him for something.
Because -- how many people knew what Litvinenko looked like before he was poisoned?
But who could forget his face now? It's unforgettable.
Maybe this is a message to Putin rather than from him.
Maybe the message is: let Khodorkovsky out of prison now.
That would be one thing to put on the list if one were making a list of things people might want to extort out of Putin.