A prominent campaigner against Vladimir Putin fears she was poisoned by a “some kind of nerve agent” while at Russian opposition meetings in Berlin or Prague.
The FBI is now investigating Natalia Arno's claims as she has lived in the US since she was exiled from Russia almost a decade ago.
Ms Arno, head of the Free Russia Foundation, claims she felt numbness and “severe pain” in her body after her hotel door was mysteriously left open and she detected what appears to be the “smell of cheap perfume”.
