A verdict of additional embezzlement charges have been laid against Alexey Navalny, who is already serving a two-and-a-half-year sentence.
The US, Germany and France have condemned Moscow's detention of Navalny and a crackdown on his supporters.
Police detain more than 3,000 in Moscow and other cities, says a monitoring group, as tens of thousands of supporters of jailed Kremlin critic take to streets following his call to protest against President Vladimir Putin's rule.
Moscow says it will not take into account European Union's demand to free Kremlin-critic Alexey Navalny, describing the calls to protest by the opposition as "troubling".
Russian opposition leader Alexey Navalny returned to Russia for the first time since he was poisoned last summer.
Kremlin critic Alexey Navalny has said he believed Russia's intelligence services poisoned him with a rare nerve agent because authorities saw him as a threat ahead of next year's parliamentary elections.
The poisoning of Alexey Navalny should not go unpunished.
Kremlin critic Alexey Navalny received treatment at the Charite hospital for just over a month, of which 24 days were spent in intensive care, after tests determined he was poisoned with a Novichok nerve agent.
Germany renews call for "Russia to make a declaration on the events" of the Navalny case after three European laboratories independently identified a military nerve agent poisoned Alexey Navalny.
Navalny, a prominent critic of President Vladimir Putin, was airlifted to Germany last month after collapsing on a flight from the Siberian city of Tomsk to Moscow.
German authorities said that tests showed that Russian opposition politician Alexey Navalny had been poisoned with a chemical nerve agent from the Novichok group.
The Kremlin was speaking a day after German Chancellor Merkel said Russian dissident Navalny had been poisoned with a Soviet-style Novichok nerve agent in an attempt to murder him.
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