Demonstrations have been held on an almost weekly basis since July after authorities denied most opposition candidates registration in the elections for city parliament next Sunday.
Exit polls say that Vladimir Putin has won the presidential election with more than 70 percent of the vote after around 30 percent of the votes counted.
Aleksei Navalny was detained for disobeying police during an unauthorised rally against alleged corruption by Prime Minister Dimitry Medmedev on March 27 in Moscow.
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