Kremlin critic Alexei Navalny was fighting for his life in a Siberian hospital on Thursday after drinking tea that his allies believe was laced with poison.
If confirmed, it would be the latest in a long series of poisonings and suspected poisonings of people who have fallen out with the Kremlin, which denies settling scores with its foes by murdering them.
Navalny, a fierce critic of Russian President Vladimir Putin and his lieutenants, began feeling ill on a plane to Moscow on Thursday morning after drinking tea at an airport cafe in the Siberian city of Tomsk.