alexei navalny
The politician’s allies said he was being held at a police precinct outside Moscow and has been refused access to his lawyer.
Navalny had spent the previous five months in Germany recovering from a nerve agent attack that he blamed on the Kremlin.
German Chancellor Angela Merkel called the poisoning an attempted murder and she and other world leaders have demanded that Russia fully investigate the case.
German chemical weapons experts have determined that he was poisoned with the Soviet-era nerve agent Novichok.
WHAT'S HAPPENING
Alexei Navalny remained hospitalized in Germany after being poisoned with a Soviet-era nerve agent, a lab determined. The Kremlin has denied involvement.
The high-profile critic of Russian President Vladimir Putin was flown to Germany on Aug. 22 after falling ill from a suspected poisoning.
Novichok, a Soviet-era nerve agent, was used to poison former Russian spy Sergei Skripal and his daughter in Britain.
Russian dissident Alexei Navalny remained in critical but stable condition at a Berlin hospital after a suspected poisoning.
But an ally of Alexei Navalny said police found traces of a dangerous poisonous substance in the politician’s system.
“We assume that Alexei was poisoned with something mixed with his tea. That’s the only thing he drank this morning.”