The wife of a Russian opposition activist hospitalised last week after a sudden illness says he has been poisoned.
Vladimir Kara-Murza Jnr, a journalist and a close associate of the murdered opposition leader Boris Nemtsov, was taken to hospital last week with a sudden illness reminiscent of a mysterious poisoning he suffered two years earlier.
No cause for that illness has been determined.
Kara-Murza's wife Yevgenia said on Tuesday doctors have told her that her husband, who has been in a medically induced coma for several days, has been diagnosed with an "acute poisoning by an unidentified substance".
She said the family sent blood samples to a private laboratory in Israel to determine the toxin.
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