Law enforcement officers detain participants in an unauthorized rally in St. Petersburg.

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Participants in an unauthorized protest rally walk down Tverskaya Street, Moscow.

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Participants in an unauthorized rally on the Field of Mars (Marsovo Pole) in St. Petersburg.

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Participants in an unauthorized rally on the Field of Mars (Marsovo Pole) in St. Petersburg.

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Police during an unauthorized protest in Moscow.

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Police and photographers are on Tverskaya Street in Moscow during an unauthorized protest.

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Participants in an unauthorized protest on Pushkinskaya Square, Moscow.

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Police and articipants in an unauthorized protest on Pushkinskaya Square, Moscow.

07.10.2017#3207750

Participants in an unauthorized protest on Pushkinskaya Square, Moscow.

07.10.2017#3207749

Police presence at an unauthorized protest on Pushkinskaya Square, Moscow.

07.10.2017#3207748

Participants in an unauthorized protest on Pushkinskaya Square, Moscow.

07.10.2017#3207746

Participants in an unauthorized protest on Pushkinskaya Square, Moscow.

07.10.2017#3207745

A girl is seen here during an unauthorized protest on Pushkinskaya Square, Moscow.

07.10.2017#3207744

Participants in an unauthorized protest on Pushkinskaya Square, Moscow.

07.10.2017#3207725

A man holds a Russian flag during an unauthorized protest on Pushkinskaya Square, Moscow.

07.10.2017#3207724

Police officers during an unauthorized protest on Pushkinskaya Square, Moscow.

07.10.2017#3207723

A man is seen here during an unauthorized protest on Pushkinskaya Square, Moscow.

07.10.2017#3207720

Participants in an unauthorized protest on Pushkinskaya Square, Moscow.

07.10.2017#3207716

A man holds a Russian flag during an unauthorized protest on Pushkinskaya Square, Moscow.

07.10.2017#3207705