Alexei Navalny, the Russian opposition leader who led protests against Russian President Vladimir Putin, was sentenced to 30 days in jail Tuesday, according to Reuters. Around 1,600 protesters—including Navalny—were detained during demonstrations ahead of Putin being sworn in for a fourth presidential term. Navalny called for over 90 towns across Russia to protest Putin’s election victory with the slogan, “Putin is not our tsar.” Navalny has been imprisoned before and has been barred from running for president. “30 days of arrest for the right to go out on the street of your city and tell the authorities: ‘I am not your slave and will never be one. I do not need a new tsar,’” Navalny wrote on Twitter after his sentence was announced.