In this photo provided by Ukraine's 33rd Mechanised Brigade press service, servicemen prepare a festive dinner on Christmas Eve in a shelter on the frontline in the Dnipropetrovsk region, Ukraine, Tuesday, Dec. 24, 2024. (Volodymyr Petrov/Ukraine's 33rd Mechanised Brigade via AP)

Military chaplain Yurii of 24th Mechanized Brigade blesses Ukrainian servicemen during Christmas near the frontline town of Chasiv Yar, Donetsk region, Ukraine, Wednesday Dec. 25, 2024. (AP Photo/Evgeniy Maloletka)

Military chaplain Yurii of 24th Mechanized Brigade holds a church service for infantry unit during Christmas near the frontline town of Chasiv Yar, Donetsk region, Ukraine, Wednesday Dec. 25, 2024. (AP Photo/Evgeniy Maloletka)

In this image provided by the Ukrainian Emergency Service, firefighters put out a fire following a Russian missile attack on the country's energy system in Dnipropetrovsk region, Ukraine, Wednesday, Dec. 25, 2024. (Ukrainian Emergency Service via AP)

Ukrainian servicemen of 117th Separate Heavy Mechanized Brigade pray before a Christmas dinner on Pokrovsk direction, Donetsk region, Ukraine, Tuesday, Dec. 24, 2024. (AP Photo/Evgeniy Maloletka)

In this image provided by the Ukrainian Emergency Service, firefighters put out the fire following a Russian missile attack on the country's energy system in Dnipropetrovsk region, Ukraine, Wednesday, Dec. 25, 2024. (Ukrainian Emergency Service via AP)

In this image provided by the Ukrainian Emergency Service on Wednesday, Dec. 25, 2024, firefighters work on a site of an apartment building destroyed by a Russian attack in Kryvyi Rih, Ukraine. (Ukrainian Emergency Service via AP)