Crowds of supporters have paid tribute to Alexei Navalny, who has been buried at a cemetery on the outskirts of Moscow.
Risking arrest, they paid tribute to the Putin critic, who died in an Arctic prison, and thanked his parents, who were also there.
Few details have been released on the cause of his death. Officials said he collapsed after going for a walk. His wife says he was killed on the orders of Vladimir Putin.
