Hundreds of Russians visited the grave of dead Russian opposition leader Alexei Navalny on Saturday, risking arrest to pay tribute to the anti-corruption campaigner for a second day running.

Navalny, President Vladimir Putin's fiercest critic for more than a decade, died in an Arctic prison colony last month, where he was serving a 19-year sentence on "extremism" charges largely seen as political retribution for his opposition to the Kremlin.