Russian opposition politician Alexei Navalny was seen walking down the stairs in a photo posted on his Instagram feed on Saturday, five days after a Berlin hospital said he had been taken off a ventilator and could breathe independently.

Navalny, the leading opponent of Russian President Vladimir Putin, fell ill on a domestic flight in Siberia last month and was airlifted to Berlin while still in a coma.

"Let me tell you how my recovery is going. It is already a clear path although a long one," Navalny wrote.