Several police buses and about ten law enforcement officers are on duty near the clinic, moving around the perimeter in groups of 2-5 people.
It is also reported that the day before, even before the ambulance with Navalny drove up to the clinic, the police asked the media workers to leave the territory of Charite.
The German military brought him to the hospital from the airport in an intensive care transporter, according to dpa news agency. The Russian opposition leader is currently in a coma and breathing through a ventilator.
Jaka Bizilj, the founder of Cinemas for Peace, the German NGO that funded Navalny's flight to Berlin, told that the politician was in stable condition.
"The good news is that he's stable, so the whole travel did not affect him," Bizilj said. "But there is no reason to celebrate because he is in a very critical condition. So the real work starts now with the doctors at the Charite," he added.