Twenty-eight people were detained in central Moscow on Tuesday during an unauthorized rally calling for the government to uphold the constitutional right to free assembly.
The rally, which was held on Triumfalnaya Square, was organized by the activist group Strategy-31, which gathers on the last day of every month with 31 days to defend Article 31 of the Constitution, which guarantees the right to free assembly.
Moscow authorities require that all rallies of more than one person receive prior permission from City Hall.
Police reported that 28 people were detained at the Tuesday rally, "despite numerous warnings that the event was unauthorized," an Interior Press Ministry statement said.