Photos: Russia opposition demonstration

Police officers detain a supporter of opposition leader and anti-corruption blogger Alexei Navalny during a rally in central Moscow.  (SERGEI ILNITSKY / EPA)

Police officers detain a supporter of opposition leader and anti-corruption blogger Alexei Navalny during a rally in central Moscow.  (YURI KOCHETKOV / EPA)

Police officers detain a supporter of opposition leader and anti-corruption blogger Alexei Navalny during a rally in central Moscow.  (YURI KOCHETKOV / EPA)

Police officers detain a supporter of opposition leader and anti-corruption blogger Alexei Navalny during a rally in central Moscow.  (Denis Tyrin / AP)

Police push supporters of Russian opposition activist and anti-corruption crusader Alexei Navalny away during unsanctioned protest in Manezhnaya Square in Moscow.  (Ivan Sekretarev / AP)

Police officers detain an opposition supporter during an unauthorized rally in support of Alexei and Oleg Navalny in central Moscow.  (AFP/Getty Images)

Police officers detain a protester during an unsanctioned protest in Moscow.  (Denis Tyrin / AP)

Police officers stand guard during an unauthorized rally in support of Alexei and Oleg Navalny in central Moscow.  (AFP/Getty Images)

Russian opposition activist and anti-corruption crusader Alexei Navalny, 38, centre, walks to attend a rally in Manezhnaya Square in Moscow.  (Anton Belitski / AP)

Supporters and opponents of Russian opposition activist and anti-corruption crusader Alexei Navalny clash during unsanctioned protest in Manezhnaya Square in Moscow.  (Ivan Sekretarev / AP)

Russian opposition activist and anti-corruption crusader Alexei Navalny, 38, centre, walks to attend a rally in Manezhnaya Square in Moscow.  (Sergey Karpov / AP)

Supporters of Russian opposition activist and anti-corruption crusader Alexei Navalny gather holding red posters reading “Navalny” during unsanctioned protest in Manezhnaya Square in Moscow.  (Ivan Sekretarev / AP)