A Moscow court has jailed Putin critic Alexei Navalny for three-and-a-half years for violating the conditions of a suspended sentence.
He has been in detention since returning to Russia last month. He was treated in Germany for a near-fatal nerve agent attack on him in August.
There have been violent scenes in Moscow – video on social media show police beating and arresting protesters who came out to support Mr Navalny.
Thousands have rallied across Russia.
Mr Navalny’s suspended sentence for embezzlement has been converted into a jail term.
He has already served a year under house arrest which will be deducted from the total.
Mr Navalny greeted the news with a resigned shrug, the BBC’s Sarah Rainsford in Moscow reports. In court he called President Vladimir Putin a “poisoner”, blaming him for the attack.
His supporters called for an immediate protest, and hundreds gathered in central Moscow and St Petersburg despite a heavy police presence. More than 850 have been detained in Moscow alone, according to monitors.
His lawyer said they would appeal against the ruling.
Strong international reaction to the sentence came quickly, with the Council of Europe – the continent’s leading human rights body – saying the judgement “defied all credibility”.
“With this decision, the Russian authorities not only further exacerbate human rights violations as already established by the European Court of Human Rights, they also send a signal undermining the protection of the rights of all Russian citizens,” said the council’s human rights commissioner, Dunja Mijatovic, in a statement.
UK Foreign Secretary Dominic Raab described the ruling as “perverse”, and German Foreign Minister Heiko Maas said the verdict was a “bitter blow to firmly established civil liberties and the rule of law”.
US Secretary of State Antony Blinken called for Mr Navalny’s immediate and unconditional release, and said he would work closely with allies to hold Russia accountable for “failing to uphold the rights of its citizens”.
Russian foreign ministry spokeswoman Maria Zakharova responded by telling Western countries to focus on their own problems.
“You should not interfere in the internal affairs of a sovereign state,” she said on Russian TV.
Mr Navalny has been accused of breaking the terms of a 2014 suspended sentence for embezzlement that required him to report regularly to Russian police. His lawyers say the accusation is absurd as the authorities knew he was recovering in Berlin from the nerve agent attack that nearly killed him in Russia.
Addressing the court before the sentencing, Mr Navalny said the case was being used to frighten the opposition: “This is how it works: they send one to jail to intimidate millions.”
On the Novichok chemical attack, he said: “Using the FSB [Federal Security Service of Russia], Putin attempted to commit murder. I’m not the only one – many know this already and many others will. And this is driving the thieving little man in the bunker crazy.
“No matter how much he tries to look like a geopolitician, he took offence at me because he will go down in history as a poisoner.”
Mr Navalny’s return to Russia on 17 January triggered mass protests in support of him, many of them young Russians who have only ever experienced President Putin’s rule.
The Kremlin has denied any involvement in the attack on him, and rejects the conclusion by Western experts that Novichok – a Russian chemical weapon – was used.
Mr Navalny accuses Mr Putin of running an administration riddled with corruption, and recently released a YouTube video featuring an opulent Black Sea palace which, he alleged, was a Russian billionaires’ gift to the president.
On Saturday Arkady Rotenberg, a billionaire businessman close to Mr Putin, said he owned the palace and had bought it two years ago.
But on Sunday some protesters brandished gold-coloured toilet brushes, a symbol of their anger about the palace. For a second weekend, crowds defied bitter cold and a massive deployment of riot police, and more than 5,000 were arrested, according to OVD-Info group.
OVD-Info says it is an independent Russian media project, which gets crowdfunding in Russia and its donors include the Memorial human rights group and the European Commission.
Mr Navalny is already serving a 30-day sentence in connection with the embezzlement case, which he denounces as politically motivated.
In recent days police have arrested many of Mr Navalny’s top aides, who assist him in his Anti-Corruption Network (FBK).
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