The bodies of scores of Ukrainian fighters killed during the siege of the Azovstal steelworks in the southern city of Mariupol are still awaiting retrieval, the former commander of Ukraine's Azov National Guard regiment said on Sunday.

Maksym Zhorin said that under the terms of a recent exchange, around 220 bodies of those killed in Azovstal had already been sent to Kyiv but "just as many bodies still remain in Mariupol."