Thousands of people have marched in Moscow in honour of the opposition politician Boris Nemtsov, who was shot dead a year ago while crossing a bridge near the Kremlin.
Five Chechen men are accused of the killing.
Mr Nemtsov's daughter, Zhanna Jana, says he was a strong critic of President Vladimir Putin and might have been seen as a threat.
"Putin is an authoritarian ruler of Russia and it's a very important feature of such kind of regimes to oppress independently minded people, no matter whether they are actively political figures."
