Alexei Navalny’s mother visits grave day after Moscow funeral

Other mourners lay flowers as police maintain presence at cemetery where opposition leader was buried

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The mother of the Russian opposition leader Alexei Navalny has visited his grave, a day after thousands of Russians risked arrest to pay tribute to the anti-corruption campaigner at his funeral.

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