On 20 August 2020, Navalny was hospitalized in serious condition after he was sickened with a nerve agent during a flight from Tomsk to Moscow.[6] He was medically evacuated to Berlin and discharged on 22 September.[7][8][9] The use of a Novichok nerve agent was confirmed by the Organisation for the Prohibition of Chemical Weapons (OPCW).[10][11] Though the Kremlin denied involvement in his poisoning,[12] the EU and the UK responded by imposing sanctions on six senior Russian officials and a state chemical centre.[13][14] Navalny accused President Vladimir Putin of being responsible for his poisoning.[15] An investigation by Bellingcat and The Insider implicated agents from the Federal Security Service (FSB) in Navalny's poisoning.[16]