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Chelsea Football Club owner Roman Abramovich was among a group who suffered symptoms consistent with poisoning after attending peace talks in Ukraine.
The Russian oligarch, who is involved in negotiations between Kyiv and Moscow, is understood – along with at least two Ukrainian negotiators – to have developed red eyes, constant and painful tears and peeling skin on their faces and hands since the meeting at the beginning of this month, The Wall Street Journal reported.
Sources told the PA news agency that Mr Abramovich had since recovered and was continuing to try to help with the negotiations.
It is understood the oligarch had been involved in talks about securing humanitarian corridors to allow Ukrainians to leave, and bringing other countries to the negotiating table.
The WSJ said the suspected attack had been orchestrated by hardliners in Russia who wanted to sabotage the talks.
The newspaper said Mr Abramovich met President Volodymyr Zelenskyy on the trip, but the Ukrainian leader was unaffected and his spokesman had no information about the alleged incident.
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Two superyachts linked to Russian billionaire Roman Abramovich were spotted on the Turkish coast on Tuesday, 'Eclipse' and 'My Solaris'. Mr Abramovich is among several wealthy Russians added to an EU blacklist as governments act to seize their yachts and other luxury assets. AP -
'My Solaris', a superyacht linked to sanctioned Russian oligarch Roman Abramovich, is pictured in Bodrum, south-west Turkey. Reuters -
A 68-metre luxury yacht called 'Ragnar', owned by a former KGB officer Vladimir Strzhalkovsky, is pictured at the quay in Narvik, north Norway. AFP -
The 'Axioma' superyacht belonging to Russian oligarch Dmitrievich Pumpyansky at a port in Gibraltar. Reuters -
'Crescent', which is believed to belong to Russian oligarch Igor Sechin, is seen docked at Marina Port Tarraco in Tarragona, Spain. Reuters -
The yacht 'Tango', owned by Russian billionaire Viktor Vekselberg, at Palma de Mallorca Yacht Club on the Spanish island of Mallorca. Reuters -
The 48m long, St Vincent and the Grenadines-flagged yacht 'Lady Anastasia', owned by Alexander Mijeev, moored at a dock in Mallorca. AFP -
Superyacht 'Valerie', linked to chief of Russian state aerospace and defence conglomerate Rostec Sergei Chemezov, at Barcelona Port in Spain. Reuters -
The 142.81m sail-assisted motor yacht 'Sailing Yacht A', owned by Russian tycoon Andrey Melnichenko, in front of Monaco harbour. Reuters -
'Dilbar', a luxury yacht owned by Russian billionaire Alisher Usmanov, sails in the Bosphorus in Istanbul, Turkey. Reuters -
'La Datcha', owned by Russian businessman Oleg Tinkov, docked at the port in Ensenada, Mexico. Reuters -
'Lady M', owned by Russian oligarch Alexei Mordashov, docked at Imperia's harbour. AFP -
Superyatch 'Amore Vero,' which French authorities have said is linked to Rosneft's CEO Igor Sechin, is seen at La Ciotat Port near Marseille in France. Reuters -
'Quantum Blue', Russian billionaire Sergei Galitsky's yacht, docked in the port of Monaco. AFP -
The world's largest expedition yacht, 'Luna', owned by Roman Abramovich, at the port of Sibenik in Croatia. Shutterstock -
The luxury 68m superyacht 'Triple Seven,' owned by Alexander Abramov, on the River Thames in London. EPA
A spokesman for the businessman previously said he was playing only a "limited" role in trying to find a "peaceful resolution" between the two countries.
Mr Abramovich was hit by UK government sanctions this month over his connections with Russian President Vladimir Putin.
The government described him as "a prominent Russian businessman and pro-Kremlin oligarch" who is "associated with a person who is or has been involved in destabilising Ukraine and undermining and threatening the territorial integrity, sovereignty and independence of Ukraine", meaning Mr Putin.
The government said Mr Abramovich had received financial benefits from the Kremlin, including tax breaks for his companies, the buying and selling of shares from and to the state at favourable rates, and contacts in the run-up to the 2018 World Cup in Russia.
"He is one of the few oligarchs from the 1990s to maintain prominence under Putin," a statement said.
Mr Abramovich has denied any association with the Russian regime.
