The Chelsea FC owner - who has now recovered - reportedly suffered sore eyes and peeling skin.
said the alleged poisoning was orchestrated by hardliners in Russia who wanted to sabotage the talks.However, our security correspondent Frank Gardner says it would hardly be surprising that the US would want to dampen down suggestions that anyone - especially Russia - had used a chemical weapon in Ukraine, as this could push them into retaliatory action that they are extremely reluctant to take.
Russian activists and journalists speaking out against their country's so-called "special military operation" in Ukraine have had their homes vandalised by unknown pro-Kremlin figures. Other examples are even more extreme. In one case, a leading Russian journalist discovered a pig's head wearing a wig on his doorstep with an anti-Semitic sticker stuck to his door.
Such vandalism is a sign of the increasingly intimidating atmosphere in Russia for those people who publicly express their opposition to the war in Ukraine.Dozens of refugees are now housed in a sports centre in Taganrog, Russia, east of Mariupol