A court in Moscow has issued an arrest warrant for the widow of Russian opposition leader Alexei Navalny on charges of extremism, according to state media.

The charges brought against Yulia Navalnaya, who lives outside Russia, in absentia are to do with her alleged "participation in an extremist society", Tass news agency said.

The opposition leader Russia's most significant for the past decade died in an Arctic Circle jail of natural causes, according to Russian authorities.

Mr Navalny had been serving 19 years on extremism charges that were widely seen as politically motivated.

But his widow accuses Russian President Vladimir Putin of killing him.

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