The New York Times reported that a man who was an advisor to Putin was hospitalized with a rare disorder that caused him to lose feeling in his hands and legs.

Anatoly Chubais quit as a top Kremlin advisor in protest of Russia's invasion of Ukraine and left the country in March.

He was hospitalized in a Western European country with Guillain-Barré syndrome, a rare and serious disease that attacks the nerves.

A common symptom of Guillain-Barre syndrome is losing feeling in his hands and legs. What caused the symptoms to start is not known.

It's not known what causes Guillain-Barré syndrome, but it's usually caused by an inflammation of the airway or the GI tract. Severe cases of the disease can be fatal.

According to The Times, doctors have to examine Chubais in protective suits.

The Times reported that Chubais served as Putin's international climate envoy.

According to unnamed sources, the former advisor resigned because he was against the Russian invasion of Ukraine.

His hospitalization came a few months after Roman Abramovich and Ukrainian negotiators had symptoms of a suspected poisoning.

Novichok was used to poison the Russian opposition leader in 2020.