The Russian state killed opposition leader and Vladimir Putin nemesis Alexei Navalny using a poison developed from a dart frog toxin, the Foreign Office has said. Two years on from the death of Mr Navalny at a Siberian penal colony, Britain and its allies have pinned the blame on the Kremlin following analysis of material samples found on his body. There is no innocent explanation for the toxin epibatidine being found on Mr Navalny’s body, the Foreign Office said. Speaking from the Munich Security Conference, Foreign Secretary Yvette Cooper said: “Since Yulia Navalnaya announced the loss of her husband here in Munich two years ago, the UK has pursued the truth of Alexei Navalny’s death with fierce determination. Only the Russian government had the means, motive and opportunity to deploy this lethal toxin against Alexei Navalny during his imprisonment in Russia. Today, beside his widow, the UK is shining a light on the Kremlin’s barbaric plot to silence his voice.” Western governments said laboratory testing had “conclusively confirmed” the presence of epibatidine, a toxin found …