Protests erupted in the Russian capital Moscow in mid-July after the Central Election Commission refused to register a large numbers of opposition-minded candidates.
In recent weeks, thousands have attended street protests calling for free and fair elections after the exclusion of several opposition figures from local Moscow polls next month.
Russian opposition is demanding free elections, after authorities disqualified a number of opposition candidates from the upcoming local polls due in September.
Prominent Russian opposition leader Alexei Navalny has been transferred from hospital back to jail to carry out the rest of his 30-day sentence while his own doctor fears he may have been poisoned.
Demonstrators were rallying against the exclusion of several opposition candidates from the ballot for this fall's Moscow council elections.
Russian opposition leader Alexei Navalny has been sentenced to 30 days in jail by a Moscow court as he was found guilty of breaking the law by organising an unauthorised Moscow rally on January 28.
Navalny, who has been detained and jailed several times for organising similar protests, was barred from running in Russia's presidential election in March.
Critics of Vladimir Putin took to the streets of Russia ahead of his inauguration for a fourth presidential term to register their opposition to what they say is his autocratic Tsar-like rule.
Nemtsov, one of the most vocal Putin critics, was gunned down shortly before midnight on February 27, 2015, while walking across a bridge a short distance from the Kremlin.
Police raid the Moscow office of opposition leader Alexei Navalny as demonstrations calling for a boycott of Russia's presidential election take place across the country.
Opposition leader Alexei Navalny asked supporters to boycott the upcoming election as the court decision allows Vladimir Putin an easy victory.
Navalny said he would use his campaign headquarters across Russia to support the boycott of next year's election.
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