Street protests have broken out in Russia in support of the opposition leader Alexei Navalny in recent days after he was jailed for breaking the parole conditions of a previously suspended sentence - because he was in Germany recovering from the nerve agent attack that nearly killed him.
Daniel Sobolev had never taken part in an unsanctioned protest until the past few weeks. He's a 19-year-old student in Moscow. Why has he decided to demonstrate?