Participants of the "Trial Stroll" with white balloons on Isaakiyevskaya Square, St Petersburg with head of St Petersburg branch of the United Civil Front in the center.

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Participants of the "Trial Stroll" on Arts Square, St Petersburg.

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Olga Kurosova, head of St Petersburg branch of the United Civil Front, talks to a police officer during the opposition's "Trial Stroll" on St Petersburg streets.

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Participants of the "Trial Stroll" with white balloons march on St Petersburg streets with head of St Petersburg branch of the United Civil Front in the center.

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Participants of the "Trial Stroll" with white balloons march on St Petersburg streets.

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Participants of the "Trial Stroll" with white balloons march on St Petersburg streets. At right is head of St Petersburg branch of the United Civil Front.

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Participants of the "Trial Stroll" with white balloons on Isaakiyevskaya Square, St Petersburg. At right is head of St Petersburg branch of the United Civil Front.

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