President Zelenskyy was demanded to release his husband after the Kremlin left him out to dry.

Zelenskyy later said that he had tried to disguise himself in military uniform, after the security service said that Medvedchuk had been arrested as he tried to flee the country.

The former chairman of the pro-Russian Ukrainian Choice political party was accused of treason.

Oksana Marchenko asked Zelenskyy to free her husband in a video posted on Wednesday.

Oksana Marchenko, the wife of Ukrainian parliament member Viktor Medvedchuk, requested President Zelenskyy to take all the necessary measures for his release.

She said that her husband did not violate Ukrainian laws and did not leave the country.

Zelenskyy had offered to trade Medvedchuk for Ukrainian prisoners.

Russia is believed to have captured thousands of Ukrainian civilians and sent them to camps where they were fingerprinted and their data was taken from their cellphones.

Russian President Vladimir Putin and Medvedchuk have holidayed together on the Black Sea.

On Wednesday, the Kremlin spokesman said that Medvedchuk was not a citizen of Russia and had nothing to do with the special military operation in Ukraine.

He is a foreign political figure.

We don't know if he wants Russia to participate in resolving this libelous situation against him.

The UK and the US both imposed sanctions on Medvedchuk on Wednesday, calling him a major Ukrainian oligarch with close ties to Putin.