Alexei Navalny: Russia's vociferous Putin critic
The flight of the arch-Putin critic was diverted to Omsk, where doctors treated him for three days before he was transferred to the Charité hospital in Berlin.
His condition is serious but not life-threatening, the Berlin doctors say.
The speaker of Russia's lower house of parliament, Vyacheslav Volodin, has ordered a committee to investigate whether foreign forces were behind the suspected poisoning "to fuel tensions inside Russia."
Mr Navalny, 44, made his name by exposing official corruption, labelling Mr Putin's United Russia as "the party of crooks and thieves". He has served several jail terms which he says were the result of politically motivated charges.
There have been a number of previous attacks on high-profile critics or opponents of President Putin, including politicians, intelligence officers and journalists. The Kremlin has always denied involvement.
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