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Police officers detain a protester during a rally against planned increases to the nationwide pension age in St. Petersburg, Russia.

Google said it required all advertisers to act in accordance with local laws, the BBC notes, and officials argued that videos violated a law prohibiting political campaigning within 24 hours of an election.

Supporters of jailed opposition leader Alexei Navalny protested across Russian Federation against planned increases to the pension age on Sunday, a challenge to the authorities who are holding regional elections on the same day.

On a single day of voting on September 9, mass riots of the supporters of Navalny took place throughout Russian Federation.

Footage of the protests, which were held in more than 80 towns and cities, showed the police sometimes using force to disperse rallies, beating participants with batons and dragging them away.

The OVD-Info group, which tracks police detentions and posts the names of the detainees on its website, said that 1,018 people were detained during Sunday's demonstrations against a government plan to increase the ages at which Russians collect their state pension.

Concessions by President Putin, whose popularity has suffered as a result, have failed to stem the discontent. Demonstrators were also arrested in more than 30 other cities, the monitor said.

Supporters of Alexei Navalny, the leader of the liberal Russian Federation of the Future party, were quick to slam the US-based multinational company for what they described as a surrender in the face of illegal demands made by the administration of President Vladimir Putin, Efe news reported.

A Reuters witness saw police detain at least one protester in Moscow.

The proposals have been heavily criticised by Russia's usually subservient press, with Moskovski Komsomolets, a popular Moscow newspaper, describing them as the "most unsafe and risky reform of President Putin's 20-year rule".

Alexei Navalny, the anti-corruption activist who is President Vladimir Putin's most prominent foe, urged supporters to protest the pension proposal Sunday before he was sentenced to 30 days in jail for organizing an unsanctioned January protest involving a different issue.

Kremlin ally, Sergei Sobyanin has been re-elected as Moscow's mayor, according to results released by Moscow election commission.

However, life expectancy in Russia remains low, at 66 for men and 77 for women, meaning that 43 percent of Russian men are not expected to reach the age of 65, according to data from the World Bank.

Elections to select the heads of 26 of Russia's 85 regions were also being held on Sunday, including in Moscow. The authorities refused to authorize most of the meetings, declaring them illegal.