The rap folk band rose to the top spot with 631 points after being given special permission to leave their war-torn country.
Stefania was originally written as a tribute to frontman Oleh Psiuk’s mother, but was repurposed as a rallying cry for Ukraine during the Russian invasion.
After their performance, they made a plea to the viewers, saying: “Help Ukraine, help Mariupol, help Azovstal right now.”
BBC breakfast continues tomorrow on BBC One at 6am.