Riot police were deployed after a city centre big screen failed and several arrests were made.
The president shocked his Western allies by ordering riot police to break up the protest.
At one stage, riot police with shields and batons were seen repeatedly striking Manchester United supporters.
Some threw petrol bombs at the riot police, who responded with tear gas and water cannons.
Riot police fired tear gas as the two sides pelted each other with stones.
On Tuesday, many of the riot police stationed just outside Red Square were fast asleep.
This time, riot police weren't called out in force and no tear gas was deployed.
Hundreds of riot police were deployed at the edge of Monday's march, but did not intervene.
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Around 600 angry Cardiff fans were involved in clashes with riot police following the match.
Squads of riot police arrived at the camps early in the morning, witnesses say.
In Kabylie's capital, Tizi Ouzou, riot police clashed with youths trying to sabotage polling stations.
Hundreds of riot police were deployed in Habib Bourguiba Avenue, the scene of earlier violence.
Then they were expelled, by an even greater number of soldiers and riot police.
Large numbers of riot police ringed the area and restricted access to the court from dawn.
An hour later the riot police moved in, arresting Mr Navalny and some 260 others.
Riot police armed with batons clashed with thousands of farmers, leaving one person dead.
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Riot police faced off not with looters but with local residents whose anger verged on mob violence.
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Riot police managed to stop that attack but smaller stores and kiosks in the suburb were looted.
Some of the anarchists had petrol bombs that snaked through the air falling around the riot police.
Riot police are also patrolling the city of Lichuan in central China after crowds attacked government offices.
This time riot police used the cover of darkness to break up the protest, beating the protesters.
Pictures spreading on Chinese social-media websites showed a burnt-out bus, crowds blocking traffic, and lines of riot police.
Fearing similar outbreaks, nervous Seoul officials sent riot police to Kimpo International Airport when Cha arrived back home.
Riot police surrounded the mosque early on Wednesday afternoon to prevent what they termed a possibly volatile situation.
Riot police have reportedly moved in to calm protestors after rioting broke out inside a metro area over taxes.
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On Wednesday, Turkish riot police attempted to dislodge the protesters and secure the area, but demonstrators scattered and returned.
Flying pickets of mineworkers sent to stop deliveries leaving from mines were met by ranks of baton-wielding riot police.
Clashes erupted soon afterwards, and the riot police had to use tear gas to keep the two sides apart.
In a sign of the Kremlin's nervousness, riot police from Moscow have been sent to deal with the trouble.
There, a large contingent of riot police appeared and cordoned off the area.
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