A Ukrainian commander holds a gun in Kherson, in southern Ukraine, Wednesday, November 16, 2022. (Photo by Bernat Armangue/AP Photo)





A Ukrainian soldier carries mortar shells before firing towards Russian positions near Bakhmut, Donetsk region, Ukraine, Thursday, December 22, 2022. (Photo by Libkos/AP Photo)





A Ukrainian soldier looks on as he fires an artillery at Russian positions near Bakhmut, Donetsk region, Ukraine, Sunday, November 20, 2022. (Photo by LIBKOS/AP Photo)





Ukrainian servicemen prepare to fire at Russian positions in the frontline near Bakhmut, Donetsk region, Ukraine, Thursday, November 24, 2022. (Photo by LIBKOS/AP Photo)





Ukrainian servicemen pray as they receive a Bethlehem Light of Peace from a comrade during Christmas holidays at their position near Kharkiv, Ukraine, Monday, December 26, 2022. (Photo by Evgeniy Maloletka/AP Photo)





Ukrainian military's Grad multiple rocket launcher fires rockets at Russian positions in the frontline near Bakhmut, Donetsk region, Ukraine, Thursday, November 24, 2022. (Photo by LIBKOS/AP Photo)





A serviceman smokes in a trench at his position on a front line in Zaporizhzhia region, Ukraine on November 3, 2022. (Photo by Reuters/Stringer)





A serviceman of the Carpathian Sich Battalion is seen at his position on a frontline, as Russia's attack on Ukraine continues, near the town of Lyman, Donetsk region, Ukraine on December 8, 2022. (Photo by Viacheslav Ratynskyi/Reuters)





Servicemen of the Carpathian Sich Battalion are seen near an Armoured Personnel Carrier (APC) on a frontline, as Russia's attack on Ukraine continues, near the town of Lyman, Donetsk region, Ukraine on December 8, 2022. (Photo by Viacheslav Ratynskyi/Reuters)





Ukrainian soldiers fire an artillery at Russian positions near Bakhmut, Donetsk region, Ukraine, Sunday, November 20, 2022. (Photo by LIBKOS/AP Photo)





A Ukrainian soldier gestures as a captured Russian tank T-80 fires at the Russian position in Donetsk region, Ukraine, Tuesday, November 22, 2022. (Photo by LIBKOS/AP Photo)





A member of the Ukrainian 63rd Separate Mechanised Brigade packs one of the brigades dogs “Gypsy” into a van while packing equipment and dismantling a frontline position that the brigade had occupied for more than five months at the border of Mykolaiv and Kehrson Oblasts as they move to a new forward position in Kherson Oblast on November 15, 2022 in Mykolaiv, Ukraine. Russian forces retreated from Kherson City and region moving forces across to the west bank of the Dnipro river. Since the retreat Ukrainian forces have kept up pressure, moving equipment and soldiers forward creating a new frontline. (Photo by Chris McGrath/Getty Images)





Ukrainian soldiers change their position at an undisclosed location in the Donetsk region, Ukraine, Thursday, November 17, 2022. (Photo by Roman Chop/AP Photo)





A Ukrainian serviceman flies a drone during an operation against Russian positions at an undisclosed location in the Donetsk region, Ukraine, Sunday, December 4, 2022. (Photo by Roman Chop/AP Photo)





A Ukrainian serviceman take a rest on the frontline at an undisclosed location in the Donetsk region, Ukraine, Saturday, November 26, 2022. (Photo by Roman Chop/AP Photo)