The Kremlin on Tuesday accused German medics of being too hasty after they said tests on Russian opposition leader Alexei Navalny indicated he was poisoned.

The 44-year-old Navalny, who is one of the fiercest critics of President Vladimir Putin and has exposed massive official corruption, is being treated in a Berlin hospital after falling ill on a flight in Siberia last Thursday.

He was treated for two days in a hospital in Siberia before being transferred to the Charite clinic.