Russian security agents were tracking every move of opposition leader Alexei Navalny in the days before he fell suddenly ill and claim they did not see any attempt to poison him, according to local media. Mr Navalny, Russia’s most outspoken critic of President Vladimir Putin, was transferred to a German hospital on Saturday and remains unconscious after what supporters say was an attempt on his life in Siberia. Doctors who treated him in a Siberian hospital before he was allowed to travel abroad have rejected claims of poisoning, saying he was suffering from a “metabolic disorder”.