Russian opposition leader and anti-corruption activist, Alexei Navalny, says he has evidence of who, how, and why he was poisoned in August.
Mr Navalny fell severely ill on a flight from Siberia to Moscow, before being transferred to Germany for specialist medical treatment.
He blames Russia, calling it "state-sponsored terrorism". But Russia has consistently denied it was involved.
Now a cross-media investigation claims to reveal the names of the individuals behind the attack, and on whose authority it was carried out.
Stuart Smith reports from Moscow.
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