Russian opposition activists plan to pay tribute to slain opposition politician Boris Nemtsov in central Moscow on February 27.
The sixth anniversary of Nemtsov's death comes after Russia's jailing of opposition political leader Aleksei Navalny and a crackdown on his allies.
Navalny's allies have called on his supporters to observe a minute of silence and lay flowers on the Bolshoi Moskvoretsky Bridge -- a short walk from the Kremlin -- where Nemtsov was gunned down on February 27, 2015.
Navalny's allies have declared a pause on protests until spring after authorities responded forcefully to a wave of national demonstrations, detaining more than 10,000 people in dozens of cities and filing administrative and criminal cases against many of them.
Last week, a Moscow court upheld a 2 1/2 year prison sentence imposed on Navalny earlier in February for a parole violation related to a previous embezzlement conviction.
The opposition said it planned a "memorial event," not a rally, to pay tribute to Nemtsov on February 27.
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