Moscow, August 22: A medical plane with Russian opposition figure Alexey Navalny on board has landed at the Berlin airport, according to the Flightradar24 air traffic tracking service.

Earlier in the day, Navalny left the Siberian city of Omsk, and initially, the aircraft was expected to head for Berlin-Schonefeld Airport.

Navalny was on a flight from the Siberian city of Tomsk to Moscow on Thursday when he became gravely ill. The airplane made an emergency landing in Omsk, where Navalny was hospitalized and fell into a coma.

He has since been put on a ventilator. Navalny's associates believe that the politician was poisoned, most likely after drinking a cup of tea at the airport in Tomsk. However, doctors consider a metabolic dysfunction and a plunge in sugar level to be the main diagnosis. Who Is Alexei Navalny? Profile of 'Poisoned' Russian Opposition Leader Known For Fierce Criticism of Vladimir Putin.

On Friday, Omsk doctors greenlighted Navalny's transportation for treatment to Germany. The Berlin-based Cinema for Peace Foundation sent a plane with a team of medical professionals to Omsk in an effort to move Navalny to the Charity Hospital.