A priest in the Ukrainian capital Kyiv says there is an increased need for blood plasma as the conflict nears the end of its fourth week.
Father Mateusz Adamski of Kyiv-Zhytomyr Diocese, which covers Ukraine's capital, told Catholic charity Aid to the Church in Need (ACN) that nuns are also donating their blood to help those injured during the Russian invasion :
"Due to the fact that there are many wounded civilians and soldiers every day, there is a need for blood donation, so residents of Kyiv have donated record amounts of blood to help both Ukrainian defenders and wounded civilians.
"The nuns, who remain in the Kyiv-Zhytomyr diocese, also became donors, because it is possible for them to do what Jesus did for us when he shed his blood so that we might live, to save the life of someone else."
The charity is donating more than £1 million of aid to Ukraine and Father Adamski is tasked with overseeing its distribution :
"The diocesan curia team with priests, nuns and lay people has delivered water, food and medication to different places, where it was needed and possible to reach.
"The diocesan staff also help in evacuating people from dangerous places."
He added volunteers were risking their lives - the diocese confirmed that the Mayor of Hostomel, north of Kyiv, was shot dead while distributing food and medicine.
Father Adamski said: "The humanitarian mission and volunteering are in danger now because of immediate risk to lives, but we continue to provide it where needed.
"We, as the Church of Christ, are with our people who are in danger, in need, vulnerable, frightened, wounded and weak".
According to official UN figures, up to three million people have fled Ukraine since the invasion began.
Sources from within the country have said that 379 schools, 117 hospitals and 43 ambulances have been damaged by Russia shelling.
Bishop Vitalii Kryvytsky, also of the diocese of Kyiv-Zhytomyr, is one of the many Church leaders who have refused to leave their flocks.
He said: "We cannot be anywhere else."