Moscow – Russian opposition figure Alexei Navalny is unconscious in hospital suffering from suspected poisoning, said his spokeswomen.
The anti-corruption campaigner fell ill during a flight and the plane made an emergency landing in Omsk, said Kira Yarmysh, adding that they suspected something had been mixed into his tea.
According to the hospital, Navalny is in a stable but serious condition.
44-year-old Navalny is a staunch critic of President Vladimir Putin.
In June, he described a vote on constitutional reforms as a “coup” and a “violation of the constitution”. The reforms allow Putin to serve another two terms in office.
Kira Yarmysh, the press secretary for the Anti-Corruption Foundation, founded by Navalny in 2011, tweeted: “This morning Navalny was returning to Moscow from Tomsk.”
“During the flight, he felt ill. The plane made an urgent landing in Omsk. Alexei has toxic poisoning.”
She added: “We suspect that Alexei was poisoned by something mixed into [his] tea. It was the only thing he drank since morning.
“Doctors are saying that the toxic agent absorbed faster through the hot liquid. Right now Alexei is unconscious.”
Yarmysh later tweeted that Navalny was on a ventilator and in a coma, and that the hospital was now full of police officers.