Russian doctors have agreed to allow the country's opposition leader Alexei Navalny, who is in a coma after a suspected poisoning, to leave the country for treatment.

The prominent critic of President Vladimir Putin is fighting for his life on a ventilator after drinking tea that his supporters believe was laced with poison.

Having previously refused his transfer to Germany, the deputy chief doctor of the Omsk hospital in Siberia where he was being treated said medics had now granted permission for his transfer abroad.

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