The Russian Defense Ministry said Thursday that 771 Ukrainian soldiers have surrendered at the Azovstal steel plant in Mariupol in the last 24 hours, taking the total to 1,730 since Monday.
The ministry said 80 of those were wounded, and all those in need of any medical attention are receiving treatment in hospitals in Novoazovsk and Donetsk.
CNN is unable to confirm the Russian tally.
The Ukrainian side has not given an update on the number who have left Azovstal nor on the status of negotiations for their exchange for Russian prisoners.
Some background: On Wednesday, the Russian Defense Ministry said nearly 1,000 Ukrainian soldiers had surrendered, meaning Thursday's new total marks a significant increase.
Ukrainian President Volodymyr Zelensky said Tuesday the negotiation process on evacuating the last soldiers from the Azovstal steel plant continues with Russia.
It follows the end of Ukrainian forces' "combat mission" at the complex, which was for weeks the last major holdout in a city otherwise occupied by Russian troops.
Ukraine said it expects to carry out an exchange of Russian prisoners of war for the severely injured soldiers.