Hundreds of protesters have clashed with police in the Russian republic of Bashkortostan in a rare display of public outrage after a court convicted a local activist and sentenced him to prison, according to media reports and rights groups. The unrest on Wednesday – one of the largest reported demonstrations since the war in Ukraine began in 2022 – erupted amid the trial this week of Fail Alsynov in the town of Baymak, about 870 miles (1,400km) south-east of Moscow, in the southern Ural mountains. Several thousand people had gathered outside the courthouse to support Alsynov, who was convicted of inciting hatred and sentenced to four years in prison, according to OVD-Info, a Russian rights group that tracks political arrests and offers legal aid. Police used teargas and batons to disperse the crowd, which chanted: “Fail, we stand with you!” along with “Freedom!” and “Disgrace!” They demanded the ousting of Bashkortostan’s governor and hurled snowballs at officers, OVD-Info and local media reported. Dozens of people were detained and injured, OVD-Info said. Alsynov was a leader of a group that advocated for preserving the Bashkir language and culture, and protested about limestone and gold mining operations in the region. The group, called Bashkort, was outlawed as extremist in 2020. He faced charges after a speech last year in an unsanctioned rally against gold mining, the Russian independent news outlet Mediazona reported. The governor of Bashkortostan, Radiy Khabirov, reportedly personally filed a complaint against Alsynov, alleging the speech denigrated other nationalities and fomented anti-government actions. Alsynov maintained his innocence, telling the RusNews outlet after the sentencing that he had “always fought for justice, for my people, for my republic”. Hundreds – and possibly thousands – of Alsynov’s supporters initially gathered in front of the courthouse on Monday when closing arguments were delivered in the case. The Russian independent news outlet Agentstvo reported that it was one of the biggest protests in Russia since the invasion of Ukraine, which has brought about more restrictive laws and an intensified crackdown on dissent. The demonstrators returned to the courthouse on Wednesday for the sentencing. Video posted by Russian media showed crowds facing off with riot police in a snowy rural landscape. Russia’s top law enforcement agency, the Investigative Committee, said it had opened a criminal case on the charges of fomenting mass riots and assaulting police officers. Several social media pages that reported on the protests or served as a platform for the local community have been blocked, according to Meduza, a popular Russian independent news outlet. The protests come just two months before a presidential election that is widely expected to give Vladimir Putin his fifth term in office. Putin, 71, is able to run again after 24 years in power due to a constitutional change he orchestrated in 2020, which reset presidential term limits. With the opposition largely suppressed and independent media banned or restricted, his re-election is all but assured. There was no immediate comment on the protests from the Kremlin. Putin is running as an independent candidate and not on a party ticket, and is required to collect at least 300,000 signatures in support of his candidacy. His campaign office reported on Wednesday that 2.5m signatures had already been collected.