People walk past a placard reading "Azovstal. Free Mariupol defenders" erected on the facade of the city hall in the center of Ukrainian capital of Kyiv on June 22, 2022. (Photo by Sergei SUPINSKY / AFP)

KYIV, UKRAINE - JUNE 21: A banner reading "Free Mariupol Defenders" hung on the Kyiv Town Hall demanding the release of Ukrainian soldiers who surrendered to Russian forces at the Azovstal Plant in the city of Mariupol, in Kyiv, Ukraine on June 21, 2022. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

KYIV, UKRAINE - JUNE 21: A banner reading "Free Mariupol Defenders" hung on the Kyiv Town Hall demanding the release of Ukrainian soldiers who surrendered to Russian forces at the Azovstal Plant in the city of Mariupol, in Kyiv, Ukraine on June 21, 2022. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

KYIV, UKRAINE - JUNE 21: A banner reading "Free Mariupol Defenders" hung on the Kyiv Town Hall demanding the release of Ukrainian soldiers who surrendered to Russian forces at the Azovstal Plant in the city of Mariupol, in Kyiv, Ukraine on June 21, 2022. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

KYIV, UKRAINE - JUNE 21: A banner reading "Free Mariupol Defenders" hung on the Kyiv Town Hall demanding the release of Ukrainian soldiers who surrendered to Russian forces at the Azovstal Plant in the city of Mariupol, in Kyiv, Ukraine on June 21, 2022. Metin Aktas / Anadolu Agency/ABACAPRESS.COM

KYIV, UKRAINE - JUNE 21: A banner reading "Free Mariupol Defenders" hung on the Kyiv Town Hall demanding the release of Ukrainian soldiers who surrendered to Russian forces at the Azovstal Plant in the city of Mariupol, in Kyiv, Ukraine on June 21, 2022. Metin Aktas / Anadolu Agency/ABACAPRESS.COM