A former mayor of Russia’s fourth-largest city has been detained on charges that could land him behind bars as part of efforts to muzzle dissent.

Yevgeny Roizman, a critic of the Kremlin, is one of the most visible and charismatic opposition figures in Russia. He enjoyed broad popularity while serving as mayor of Yekaterinburg, a city of 1.5 million people in the Ural Mountains.

Last year, Mr Roizman, 60, who was the mayor from 2013 to 2018, faced accusations of discrediting the Russian military and was barred from attending public events, using the internet, telephone or mail and communicating with anyone other than his lawyers and close family.

Police arrested him on Thursday on charges of reposting material containing a reference to the organisation led by jailed Russian opposition leader Alexei Navalny that was banned by authorities.

Mr Roizman rejected the accusations, telling a court in Yekaterinburg during a hearing after his detention that he was not registered on that social network. His lawyer said the repost was done by members of one of his numerous support groups.

If convicted, he could face a 15-day arrest or new criminal charges related to the alleged violation of the terms of his sentence last year.

Courts repeatedly fined him last year on charges of discrediting the military, paving the way for a criminal case that could be opened for repeat offenders.

Days after President Vladimir Putin sent troops into Ukraine last year, Russian legislators approved legislation that outlawed the alleged disparagement of the Russian military or the spread of “false information” about the country’s military operation in Ukraine.

Courts across the country have increasingly handed out prison terms to critics of Moscow’s actions in Ukraine.

Mr Roizman remains one of the few visible opposition figures in Russia who had not yet been been jailed or fled the country under pressure from authorities.

Another prominent opposition politician, Ilya Yashin, was sentenced to eight and a half years in prison on charges of discrediting the military, and another, Vladimir Kara-Murza, has been jailed on the same charges and is facing trial.