Navalny's release comes a week after fellow critic Boris Nemtsov was murdered in an alleged political killing.
Civil society in Russia is frail but will prosper with Western support.
The Kremlin opposition leader's computer was taken and his office searched after his death.
The murder of Boris Nemtsov strikes at the heart of the opposition to Vladimir Putin
Deputy prime minister attends as Kremlin continues to deny involvement in murder.
Russian media outlets have been providing increasingly odd scenarios behind the death of the opposition leader.
Facing an uncertain future, Russia's opposition leaders mourn the 'irreplaceable guy with brass balls'.
Anna Duritskaya says police are "physically preventing" her from ending round-the-clock supervision.