Members of the pro-Ukrainian Russian ethnic Siberian Battalion practice at a military training close to Kyiv, Ukraine, Wednesday, December 13, 2023. Ukraine's military has formed a battalion of soldiers made up entirely of Russian citizens who want to fight against Russian invasion. (Photo by Efrem Lukatsky/AP Photo)





Members of the pro-Ukrainian Russian ethnic Siberian Battalion practice at a military training close to Kyiv, Ukraine, Wednesday, December 13, 2023. (Photo by Efrem Lukatsky/AP Photo)





Ukrainian soldiers practice on a tank during military training, in Ukraine, Wednesday, December 6, 2023. A gloomy mood hangs over Ukraine’s soldiers nearly two years after Russia invaded their country. Ukrainian soldiers remain fiercely determined to win, despite a disappointing counteroffensive this summer and signs of wavering financial support from allies. (Photo by Efrem Lukatsky/AP Photo)





Ukrainian servicemen cry near the coffin of their comrade Andrii Trachuk during his funeral service on Independence square in Kyiv, Ukraine, Friday, December 15, 2023. Trachuk was a veteran of Revolution of Dignity and was killed by Russian forces on Dec. 9, 2023 near Kherson. (Photo by Evgeniy Maloletka/AP Photo)





A serviceman of Ukraine's 45th separate artillery brigade feeds a stray dog near a Swedish-made Archer self-propelled howitzer system in a forest in the Donetsk region, amid Russia’s attack on Ukraine on December 16, 2023. (Photo by Thomas Peter/Reuters)





Ukrainian serviceman prepares an explosive device for a kamikaze FPV drone near a front line, amid Russia's attack on Ukraine, near the city of Bakhmut in Donetsk region, Ukraine on December 12, 2023. (Photo by Inna Varenytsia/Reuters)





A Ukrainian soldier looks out from a tank as he holds his position near to the town of Bakhmut, Donetsk region, on December 13, 2023, amid the Russian invasion of Ukraine. (Photo by Anatolii Stepanov/AFP Photo)





Ukrainian servicemen sit on the bed of a truck while driving in the Donetsk region, amid Russia’s attack on Ukraine on December 17, 2023. (Photo by Thomas Peter/Reuters)





Ukrainian doctor code-named “Yojik”, commander of a medical battalion of the 65th Mechanized Brigade of the Ukrainian Army treats a soldier injured in the arm by shrapnel in Zaporizhzhia, Ukraine on December 05, 2023. Ukrainian medics provide first aid to soldiers wounded in the fighting who working on this front also stay in the trenches like the soldiers. (Photo by Ozge Elif Kizil/Anadolu via Getty Images)





Ukrainian servicemen take part in a military training which focuses on fighting sabotage groups, in the Chernihiv region, on December 5, 2023, amid the Russian invasion of Ukraine. (Photo by Roman Pilipey/AFP Photo)





Chaplain Ivan of the Orthodox Church of Ukraine reads a prayer for Ukrainian servicemen of the 72nd mechanized brigade during the sacred liturgy before the upcoming Christmas at the frontline near Vuhledar, Ukraine, Friday, December 15, 2023. (Photo by Valentyn Kuzan/AP Photo)





Members of the pro-Ukrainian Russian ethnic Siberian Battalion rest at a military training close to Kyiv, Ukraine, Wednesday, December 13, 2023. Ukraine's military has formed a battalion of soldiers made up entirely of Russian citizens who want to fight against Russian invasion. (Photo by Efrem Lukatsky/AP Photo)





Ukrainian serviceman launches a kamikaze FPV drone at a front line, amid Russia's attack on Ukraine, near the city of Bakhmut in Donetsk region, Ukraine on December 12, 2023. (Photo by Inna Varenytsia/Reuters)





A member of the Siberian Battalion of the Ukraine's Armed Forces International Legion smokes a disposable vape during military exercises, amid Russia's attack on Ukraine, at an undisclosed location in Kyiv region, Ukraine on December 13, 2023. (Photo by Valentyn Ogirenko/Reuters)





Members of the Siberian Battalion of the Ukraine's Armed Forces International Legion attend military exercises, amid Russia's attack on Ukraine, at an undisclosed location in Kyiv region, Ukraine on December 13, 2023. (Photo by Valentyn Ogirenko/Reuters)