Flowers for Alexei Navalny laid at Nemtsov Place, Parliament Hill

Alexei Navalny died in an Arctic penal colony in Siberia on February 16.

The 47-year-old was a fierce foe of Russian President Vladimir Putin, crusading against official corruption and staging massive anti-Kremlin protests.

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Since his death, floral tributes have been placed at Boris Nemstov Place at the junction of Highgate Road, Highgate West Hill and Swain's Lane.

Boris Nemtsov repeatedly spoke out against Vladimir Putin’s regime and campaigned to uphold democracy in Russia.

He was shot four times in the back and killed crossing the Bolshoy Moskvoretsky Bridge, near the Kremlin in Moscow, as he walked home with his Ukrainian girlfriend Anna Duritskaya after a night out on February 27, 2015.

Floral tributes outside the Russian Embassy in London for jailed Russian opposition leader Alexei Navalny who died on Friday. Moscow's federal prison service said felt unwell after a walk on Friday and lost consciousness and died (Image: PA)

Navalny's widow, Yulia Borisovna Navalnay, vowed on Monday (February 19) to continue his fight.

Before death he was an anti-corruption crusader, protest organiser and politician with an arch sense of humour, became the subject of an award-winning documentary.

His channels on YouTube had millions of subscribers.

Mr Navalny was also the first opposition leader in Russia to receive a lengthy prison sentence in recent years.