Russian oligarch Roman Abramovich and Ukrainian peace negotiators suffered symptoms of suspected poisoning after a meeting in Kyiv earlier this month, people familiar with the matter said.

Mr. Abramovich, Ukrainian lawmaker Rustem Umerov and another negotiator developed symptoms following the March 3 meeting in Kyiv that included red eyes, constant and painful tearing, and peeling skin on their faces and hands, the people said. Mr. Abramovich has shuttled between Moscow, Belarus and other negotiating venues since Russia invaded Ukraine.

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