MOSCOW, July 31. /TASS/. Anatoly Chubais, the ex-CEO of Rusnano corporation and a former Russian presidential envoy, is getting better after treatment against the Guillain-Barre syndrome at a European clinic, a source close to Chubais told TASS on Sunday.

"Anatoly Borisovich was taken to hospital after he developed symptoms of the Guillain-Barre syndrome. Now his condition has improved," he said.

Earlier in the day, TV host Ksenia Sobchak wrote on her Telegram channel, citing Chubais’ wife, Avdotya Smirnova, that Chubais was in an intensive care department at a European clinic.

Guillain-Barre syndrome is a rare, serious neurological disorder. It is an autoimmune disease that affects the peripheral nervous system. It can cause muscle weakness, reflex loss, and numbness or tingling in parts of your body. It can lead to paralysis, which is usually temporary. The exact cause of Guillain-Barre syndrome is unknown but in most cases it is preceded by a bacterial or a virus infection, including SARS-CoV-2. According to medics, some coronavirus vaccines add to the risks of this syndrome.

Chubais was dismissed from the post of Russian presidential envoy for relations with international organization in the interests of sustainable development in March.

According to a source close to Chubais, he left Russia onboard a private plane in late March.