Hundreds of Russian opposition protesters marched to mark the anniversary of a demonstration that ended in clashes with police and several prosecutions.
The rally on 6 May last year has became a touchstone for discontent over the detention of 17 protesters on public order offences.
Today was the eve of Vladimir Putin's inauguration for a third presidential term.
Opposition leaders, including anti-corruption blogger Alexei Navalny, stayed away from the low-key march on Orthodox Easter Sunday.
They plan to take part in the rally on Monday to mark a year since the protest on Moscow's Bolotnaya square.
Protesters marching on a rainy day in Moscow demanded the release of the so-called Bolotnaya 17 detainees.
They chanted "Russia without Putin!" and "37 won't work", in a reference to the Stalinist purges of 1937.
One Bolotnaya detainee was jailed for four and a half years last November after admitting public order offences.
Several cases have not come to trial, while other suspects have retracted confessions they say they gave under duress.
Protests against alleged ballot fraud in the parliamentary election of December 2011 and the March 2012 presidential vote had attracted up to 100,000 people.
Crowds have since dwindled.
Rather than engaging in a dialogue with activists, President Putin responded to the protests by pushing through laws which the opposition says are meant to stifle dissent.
Some of the laws included tightening legislation on defamation and increasing fines for protesters.
The president has denied political persecution but said Russia needed order and discipline.
