Protests, poisoning and prison: The life of Alexei Navalny and his opposition to Vladimir Putin - Alexei Navalny was a fierce critic of Russian president Vladimir Putin

European countries say tests show Russia's Alexei Navalny was poisoned with a substance developed from a toxin found in Ecuadorian dart frogs.

Analyses of samples taken from Navalny’s body have “conclusively confirmed the presence of epibatidine,” the statement said.