Navalny had been hospitalized on 20 August 2020, in serious condition after he was poisoned with a Novichok nerve agent during a flight from Tomsk to Moscow. He was medically evacuated to Berlin and discharged on 22 September.&lt;ref name="reuters-02/09/20"&gt;&lt;/ref&gt; The use of a Novichok nerve agent was confirmed by the Organisation for the Prohibition of Chemical Weapons (OPCW). Though the Kremlin denied involvement in his poisoning, the EU and the UK responded by imposing sanctions on six senior Russian officials and a state chemical centre. Navalny accused President Vladimir Putin of being responsible for his poisoning. An investigation by Bellingcat and "The Insider" implicated agents from the Federal Security Service (FSB) in Navalny's poisoning.