A worker decorates a Christmas tree, in the course of Russia-Ukraine conflict in Mariupol, Russian-controlled Ukraine, December 24, 2022. REUTERS/Alexander Ermochenko

A firefighter works to repair a car in a fire station adorned with Christmas decorations, as Russia's attack on Ukraine continues, during intense shelling on Christmas Day at the frontline in Bakhmut, Ukraine, December 25, 2022. REUTERS/Clodagh Kilcoyne

A believer prays during a service on the eve of Christmas, amid Russia's attack on Ukraine, in Kyiv, Ukraine December 24, 2022. REUTERS/Valentyn Ogirenko

Relatives and supporters of Ukrainian prisoners of war (POWs) from of the Azov regiment attend a performance named "Azov regiment Christmas in captivity" demanding to speed up their release from a Russian captivity, amid Russia's attack on Ukraine, at the Independence Square in Kyiv, Ukraine December 24, 2022. REUTERS/Gleb Garanich

A woman takes shelter as a firefighter works to repair a car in a fire station adorned with Christmas decorations, as Russia's attack on Ukraine continues, during intense shelling on Christmas Day at the frontline in Bakhmut, Ukraine, December 25, 2022. REUTERS/Clodagh Kilcoyne

Artists perform during Christmas celebrations at a position of servicemen of the Ukraine National Guard, amid Russia's attack on Ukraine, in Kharkiv region, Ukraine December 24, 2022. REUTERS/Vyacheslav Madiyevskyy

A municipal worker decorates a Christmas tree during heavy fog at the Sofiyska square, amid Russia's invasion of Ukraine, in Kyiv, Ukraine December 17, 2022. REUTERS/Vladyslav Musiienko

Ukrainian territorial defence member Leonid Onyshchenko, 63-year-old, speaks to his family during a festive Christmas dinner, as Russia's attack on Ukraine continues, in Kostiantynivka, Ukraine, December 24, 2022. REUTERS/Clodagh Kilcoyne TPX IMAGES OF THE DAY

People play music during Christmas celebrations in the Church of the Nativity of the Most Holy Theotokos in the village of Kryvorivnia in Ivano-Frankivsk region, Ukraine December 25, 2022. REUTERS/Yuriy Rylchuk

A man lights a candle during a service on the eve of Christmas, amid Russia's attack on Ukraine, in Kyiv, Ukraine December 24, 2022. REUTERS/Valentyn Ogirenko

A Ukrainian BM-21 Grad multiple rocket launcher fires a rocket, as Russia's attack on Ukraine continues, during intense shelling on Christmas Day at the frontline in Bakhmut, Ukraine, December 25, 2022. REUTERS/Clodagh Kilcoyne

A Christmas tree is seen in front of an Orthodox cathedral during a service on the eve of Christmas, amid Russia’s attack on Ukraine continues, in Kyiv, Ukraine December 24, 2022. REUTERS/Valentyn Ogirenko TPX IMAGES OF THE DAY

A worker decorates a Christmas tree, as a building damaged in the course of Russia-Ukraine conflict is seen in the background, in Mariupol, Russian-controlled Ukraine, December 24, 2022. REUTERS/Alexander Ermochenko

People gather around a Christmas tree, amid Russia's attack on Ukraine, at the Sofiyska Square in Kyiv, Ukraine December 19, 2022. REUTERS/Valentyn Ogirenko

Relatives and supporters of Ukrainian prisoners of war (POWs) from of the Azov regiment attend a performance named "Azov regiment Christmas in captivity" demanding to speed up their release from a Russian captivity, amid Russia's attack on Ukraine, at the Independence Square in Kyiv, Ukraine December 24, 2022. REUTERS/Gleb Garanich

A priest Oleksandr of Orthodox Church of Ukraine conducts the Christmas service at a positions of servicemen of the Ukrainian National Guard, amid Russia's attack on Ukraine, in Kharkiv region, Ukraine December 24, 2022. REUTERS/Vyacheslav Madiyevskyy

A woman sings a carol in front of a Christmas tree, amid Russia's attack on Ukraine, at the Sofiyska Square in Kyiv, Ukraine December 19, 2022. REUTERS/Valentyn Ogirenko

Local residents sing Christmas carols during an air raid alarm, amid Russia's attack on Ukraine, inside a metro station in Kyiv, Ukraine December 25, 2022. REUTERS/Valentyn Ogirenko

Orthodox priests conduct a service on the eve of Christmas, amid Russia's attack on Ukraine, in Kyiv, Ukraine December 24, 2022. REUTERS/Valentyn Ogirenko

Ukrainian servicemen with the Dnipro-1 Special Tasks Patrol Police regiment Raphael Karapitian 45, carries a decorated Christmas tree to the trenches on the front line, as Russia's attack on Ukraine continues, on Christmas Eve in Bakhmut, Ukraine, December 24, 2022. REUTERS/Clodagh Kilcoyne