MOSCOW -- Russian opposition leader Alexei Navalny has been sent to a prison outside Moscow to serve his sentence, his lawyer said Thursday, a move that comes despite a demand by Europe's top human rights court for his release.

Navalny lawyer Vadim Kobzev didn't immediately say what prison he was sent to. Russian news reports have previously indicated that Navalny, who has been held in a maximum-security jail in Moscow, would likely be sent to a facility in western Russia.

Navalny, 44, Russian President Vladimir Putin's most vociferous foe, was arrested on Jan. 17 upon returning from Germany, where he spent five months recovering from a nerve-agent poisoning that he blames on the Kremlin. Russian authorities have rejected the accusation and accused Navalny of co-operating with Western intelligence agencies -- claims he has ridiculed.

Earlier this month, Navalny was sentenced to 2 1/2 years in prison for violating the terms of his probation while convalescing in Germany. The sentence stems from a 2014 embezzlement conviction that Navalny has rejected as fabricated -- and which the European ?ourt of Human Rights has ruled to be unlawful.

Navalny's arrest has fueled a wave of protests that drew tens of thousands to the streets across Russia. Authorities have detained about 11,000 people, many of whom were fined or given jail terms ranging from seven to 15 days.

Russian officials have dismissed demands from the United States and the European Union to free Navalny and stop the crackdown on his supporters.

Moscow also rejected the ECHR ruling that, citing risks to Navalny's life in custody, ordered the Russian government to release him. The Russian government has rebuffed the court's demand as unlawful and "inadmissible" meddling in Russia's home affairs.

Earlier this week, EU foreign ministers agreed to impose new sanctions against Russian officials linked to Navalny's jailing.

Since Navalny's arrest, Russian officials and state news media have aggressively tried to discredit him, a change from the previous tactic of largely ignoring him.

Some of the criticism has emphasized anti-migrant views expressed years ago as he was rising to prominence.

Amnesty International this week stripped Navalny of his designation as a "prisoner of conscience" because of those views. "Navalny had, in the past, made comments which may have amounted to advocacy of hatred that constitutes incitement to discrimination, violence or hostility," the organization said in a statement Thursday.

The statement denied the move was in response to external pressure, but news reports have suggested Amnesty International was targeted in a co-ordinated campaign to discredit him.

"These were not independently acting activists ... these were people who would like to defame Alexei as the most prominent opponent of Mr. Putin," Vladimir Ashurkov, executive director of Navalny's anti-corruption organization, said in a conference call Thursday.

Amnesty International said rescinding the prisoner-of-conscience designation does not change its demand for Navalny to be freed.

"There should be no confusion: nothing Navalny has said in the past justifies his current detention, which is purely politically motivated. Navalny has been arbitrarily detained for exercising his right to freedom of expression, and for this reason we continue to campaign for his immediate release," it said.

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Jim Heintz in Moscow contributed to this report.