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will consider exchanging prisoners from Ukraine'sÌýAzov battalion for , a wealthy Ukrainian businessman close to President , a Russian negotiator said on Saturday.

"We are going to study the possibility," said Leonid Slutsky, a senior member of Russia's negotiating team on Ukraine, speaking from the separatist city of Donetsk in southeastern Ukraine, the RIA Novosti news agency reported.

Medvedchuk, 67, is a politician and one of Ukraine's richest people and is known for his close ties to Putin.

He escaped from house arrest after Russia's brutal invasion of Ukraine in February but was re-arrested in mid-April.

On Friday, the Russian army announced that the last defenders of the strategic port city of Mariupol, in southeastern Ukraine, had surrendered after holding out at the Azovstal steelworks for weeks.

Among the Ukrainian fighters who gave themselves up to the Russian troops were members of the Azov regiment, a former paramilitary unit which has integrated into the Ukrainian armed forces.

Russia describes the unit, which has previous links to far-right groups, as a neo-Nazi organisation.

On 26 May, the Russian Supreme Court is scheduled to consider a request to classify the Azov regiment as a "terrorist organization," which could complicate an exchange of these prisoners.

, leader of the Donetsk separatists, said on Saturday that the Ukrainian soldiers who defended the Azovstal plant should be put on trial.

"I believe that a legal case is inevitable: justice must prevail," said Pushilin, quoted by ¸é±õ´¡Ìý±·´Ç±¹´Ç²õ³Ù¾± at the same news conference at which Slutsky spoke.