He took ill immediately after a dinner with Ukrainian officials who had ties with Russian officials. He asked for a clean cup, poured what turned out to be a cold cup, took a sip and that did it. In 2015, Russian activist Vladimir Kara Murza Jr was suddenly taken ill after a lunch at a restaurant. In 2018, activist with the Russian activist group Pussy Riot, Pyotr Verzilov, was taken ill and hospitalised after a court hearing. In August 2020, Navalny was taken ill on a flight from Tomsk to Moscow.

Source: The Telegraph February 18, 2024 20:56 UTC