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Vladimir Putin critic Alexei Navalny is fighting for his life in hospital amid claims his tea was spiked with poison.
The lawyer was heard screaming in agony as he fell seriously ill on a flight to Moscow.
Video shows fierce Kremlin foe Navalny, 44, being stretchered from the aircraft to a waiting ambulance in the Siberian city of Omsk.
He was unconscious, according to his press secretary, Kira Yarmysh, who suspects poison was added to his tea.
He was rushed to hospital with an initial diagnosis of “toxic poisoning”.
Earlier Navalny was snapped drinking from a cup at a cafe at Tomsk airport before catching his flight.
The alleged poisoning comes two years after the novichok attack on ex-Russian spy Sergei Skripal, 67, and his 34-year-old daughter Yulia, by Putin-backed GRU agents in Salisbury, Wiltshire.
And it comes 14 years after Alexander Litvinenko - another ex-spy turned Putin critic - died after his tea was poisoned with radioactive polonium-210 in London.