Exiled Russian activist Natalia Arno victim of suspected poisoning in Prague

Natalia Arno, a US-based exiled Russian opposition activist who heads the Free Russia Foundation, fell ill in early May 2023 after attending an opposition conference organised in Berlin by former oil tycoon Mikhail Khodorkovsky and then travelling to Prague. According to her own account and contemporaneous reporting, she returned to her Prague hotel room on the night of 2 to 3 May 2023 to find the door open and a strange smell, which she likened to cheap perfume, lingering inside.

Arno later said she woke before dawn with sharp pain and numbness spreading through her body, with symptoms concentrated in her mouth, tongue, teeth, ears, chest and spine, along with a metallic taste and blurred vision. She cut her trip short, flew back to Washington and sought medical care. She reported that doctors told her she had been exposed to a neurotoxic substance, though the precise toxin was not publicly identified and the toxicology results were not disclosed.

Arno said US authorities, including the FBI, opened an investigation, but she has not received a conclusive answer. On 21 May 2023 German police confirmed they were examining suspected poison attacks against Arno and a second Russian exile, a journalist who had also attended the Berlin conference. No perpetrator has been publicly identified and no formal attribution has been confirmed.

Russian state involvement is suspected but not proven. Arno's profile as a prominent exiled Kremlin critic, the circumstances of her illness, and the broader pattern of poisonings and surveillance targeting Russian dissidents abroad point toward state-linked services. However, the specific toxin was never publicly confirmed, toxicology was reportedly inconclusive, no suspect has been named, and the FBI and German inquiries have not produced public findings. Attribution therefore rests on circumstantial pattern evidence rather than confirmed forensic or investigative results.