Moving this here. Although looks spammy.
https://bank.gov.ua/en/news/all/natsionalniy-bank-vidkriv-spetsrahunok-dlya-zboru-koshtiv-na-potrebi-armiyi

Besides this EU citizens have can help Ukrainians via EU institutions:
https://european-union.europa.eu/priorities-and-actions/eu-support-ukraine_en
https://eu-solidarity-ukraine.ec.europa.eu/helping-ukrainians-how-you-can-donate-and-engage_en#international-and-private-sector-donations
I think it's more about supporting the refugees. I recall from last year that there was a EU bank account which accepted donations and sent to Ukraine. I couldn't find that specific one.