What is Havana Syndrome, illness linked to Russia in U.S. officials AxiosUnraveling Havana Syndrome: New evidence links the GRU’s assassination Unit 29155 to mysterious attacks on U.S. officials and their families The InsiderUS defense official had ‘Havana syndrome’ symptoms during a 2023 NATO summit, the Pentagon confirms The Associated PressRussian nexus revealed during 60 Minutes Havana Syndrome investigation into potential attacks on U.S. officials CBS NewsUS defense official had ‘Havana syndrome’ symptoms during a 2023 NATO summit, the Pentagon confirms The Hill