Five European countries say tests confirm Russian opposition leader Alexei Navalny was poisoned with a lethal toxin found in poison frogs, and they blame the Russian state.

Five European countries claim that Russian opposition leader Alexei Navalny was poisoned with a deadly toxin and blame the Kremlin for it. The foreign...

There is no innocent explanation for the toxin, called epibatidine, being found in samples taken from Navalny's body, the Foreign Office said.