Police in Russia's far eastern city of Vladivostok have detained at least 20 protesters who were demonstrating for their constitutional rights, RFE/RL's Russian Service reports.
About 100 demonstrators gathered in the city center to promote freedom of assembly, which is guaranteed under Article 31 of the Russian Constitution.
RFE/RL reports that the protesters were distributing leaflets with the text of Article 31 and holding placards saying "Freedom of Speech, Freedom of Elections!" and "For Your Freedom And Ours!"
Human rights activists and opposition supporters schedule such gatherings regularly across Russia on the last day of every month that has 31 days.
Russian authorities have never permitted the Article 31 actions.