Russian opposition leader Alexei Navalny, who fell into a coma after a suspected poisoning, was flown to Germany for treatment Saturday following a day-long standoff over whether he would be allowed to leave a Russian hospital.

Navalny has promoted opposition candidates to Russian President Vladimir Putin since he was kept from running against the longtime leader in 2018’s presidential election.

He fell ill Thursday while on a flight and was taken to a Siberian hospital following an emergency landing. His allies suspect tea he was drinking was poisoned by someone linked to Putin.

Navalny was first OK'd to be transferred to a Berlin hospital Friday, but when the German plane equipped with medical supplies arrived, his Russian doctors said he was too fragile to travel, leading supporters to believe his transfer was delayed for political reasons -- until any poison would be untraceable in his system.