Documentary by Andrei Nekrasov âÂÂWho did it?â asked the filmmaker Andrei Nekrasov when his friend the exiled Russian agent Alexander Litvinenko died of polonium poisoning in a London hospital in November 2006. That question resonates throughout âÂÂPoisoned by Polonium: The Litvinenko File,â Mr. NekrasovâÂÂs extraordinary testament to a man whose incendiary allegations against his government might have had fatal consequences.
