The United Nations is working to broker the evacuation of civilians from the last defensive stronghold in the port city of Mariupol, while resistance at a steel mill continues to hold out.
Ukrainian forces were fighting village by village to contain a Russian advance through the east of the country on Saturday.
About 100,000 civilians are still in the city, while up to 1,000 live under a Soviet-era steel millaccording to Ukrainian authorities.
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Ukraine did not say how many fighters are also at the Azovstal steelworks, which is the only part of Mariupol not occupied by Russian forces.
However, Russia put the number at around 2,000.
Russian state media reported that 25 civilians were evacuated from the plant on Saturday, although the deputy commander of Ukrainian forces inside said the number was 20.
Russian news agency RIA Novosti said 19 adults and six children had been rescued, but gave no further details.
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Videos and images from inside the steel mill were shared by two Ukrainian women who said their husbands were among the fighters who refused to surrender there.
The footage showed unidentified men with stained bandages, while others had open wounds or amputated limbs.
The women also said medical staff are treating at least 600 injured people and identified their husbands as members of the Azov Regiment of the Ukrainian National Guard.
They added that some of the wounds were festering with gangrene.
In the video, the men said they only eat once a day and share just 1.5 liters of water a day between four people, and that supplies inside the beleaguered facility are depleted.
The women claimed the video was taken last week in the maze of passages under the plant.
A shirtless man appeared to be in pain as he described his wounds – two broken ribs, a punctured lung and a dislocated arm that “was dangling from the flesh”.
He said: “I want to say to everyone who sees this: if you don’t stop it here, in Ukraine, go further, in Europe.”
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The Azov Regiment of the Ukrainian National Guard is an experienced volunteer force that is considered one of the most capable units in Ukraine.
It was formed in 2014 by far-right activists led by Andriy Biletsky at the start of the separatist conflict in eastern Ukraine.
Eventually, it became part of the National Guard of Ukraine, but many of its troops are members of the far-right political group, the National Corps, formed by Biletsky.