A prominent Russian opposition figure was flown to Germany for treatment of suspected poisoning on Saturday, his spokeswoman said, after a day of delays in which Russian doctors offered a variety of reasons to block his transfer.

The opposition leader, Aleksei A. Navalny, who had been in a coma since Thursday, was flown from the Siberian city of Omsk to Berlin on a Challenger 604 air ambulance arranged by the foundation of a movie producer based in the German capital. The evacuation came after a team of German doctors, who had arrived in Omsk on the air ambulance, stated unequivocally on Friday that it was safe for him to travel.

Mr. Navalny’s personal doctor, Anastasia Vasilyeva, said in an interview Friday that she believed the Russian authorities had tried to delay his departure long enough for the poison in his system to diminish and become difficult or impossible to identify.