On 23 November when Russian missiles hit Kyiv, most of the city’s hospital was left without most of its power.
A team of doctors continued to work despite the outage; performing heart surgery on a baby under the dim light of handheld LED torches and some support from electrical generators.
During the day of the attack, Kyiv Heart Institute successfully completed 10 open-heart surgeries.
The BBC spoke to Professor Borys Todurov, who lead the teams as they operated in near-darkness.
Video by Gem O’Reilly