Up to 15,000 people are now taking shelter in Kyiv metro stations, according to the official in charge of the city’s subway.
Viktor Brahinsky told Ukrainian media that the underground can accommodate up to 100,000 people.
He added that the system currently has water and bathrooms, as well as food and medicine.
“Many people have nowhere to go. A few metres on the floor and a blanket have become their only home,” he said, reports the BBC Ukrainian Service.
“We urge people to bring warm clothes, food and support for those around them – especially women with small children and the elderly,” he added.