A Ukrainian soldier smiles atop an APC on the frontline in the Luhansk region, Ukraine, Sunday, May 21, 2023. (Photo by Libkos/AP Photo)





Ukrainian soldiers on a tank ride along the road towards their positions near Bakhmut, Donetsk region, Ukraine, Tuesday, May 23, 2023. (Photo by Efrem Lukatsky/AP Photo)





A Ukrainian soldier rides atop an APC on the frontline in the Luhansk region, Ukraine, Sunday, May 21, 2023. (Photo by Libkos/AP Photo)





Ukrainian service members walk to an armoured personnel carrier outside of the frontline town of Bakhmut, amid Russia's attack on Ukraine, in Donetsk region, Ukraine on May 23, 2023. (Photo by Yevhenii Zavhorodnii/Reuters)





Ukrainian servicemen carry a coffin with the body of a person who is considered to be former U.S. Army soldier Nicholas Maimer, killed in the frontline town of Bakhmut, after prisoners of war (POWs) swap, amid Russia's attack on Ukraine, in Donetsk region, Ukraine on May 25, 2023. (Photo by Yevhenii Zavhorodnii/Reuters)





A Ukrainian soldier is seen in a trench at the frontline near Bakhmut in the Donetsk region, Ukraine, Monday, May 22, 2023. (Photo by Libkos/AP Photo)





A Ukrainian soldier carries supplies in a trench at the frontline near Bakhmut in the Donetsk region, Ukraine, Monday, May 22, 2023. (Photo by Libkos/AP Photo)





Ukrainian service member of the anti-aircraft, missile and artillery division of the 57th separate motorised infantry brigade, smokes at his position, amid Russia's attack on Ukraine, near the town of Chasiv Yar in Donetsk region, Ukraine on May 17, 2023. (Photo by Sofiia Gatilova/Reuters)





A Ukrainian soldier is seen in a trench at the frontline near Bakhmut in the Donetsk region, Ukraine, Monday, May 22, 2023. (Photo by Libkos/AP Photo)





A Ukrainian soldier sits in a trench at the frontline near Bakhmut in the Donetsk region, Ukraine, Monday, May 22, 2023. (Photo by Libkos/AP Photo)





A Ukrainian soldier fires an RPG toward Russian positions at the frontline near Bakhmut in the Donetsk region, Ukraine, Monday, May 22, 2023. (Photo by Libkos/AP Photo)





Ukrainian soldiers help their wounded fellow at a medical stabilisation point near Bakhmut, Donetsk region, Ukraine, Wednesday, May 24, 2023. (Photo by Efrem Lukatsky/AP Photo)





Ukrainian soldiers ride in an armoured personnel carrier on the front line in the Luhansk region on May 21, 2023. (Photo by Libkos/AP Photo)





Fighters of Russian Volunteer Corps prepares for the press conference not far from the border in Sumy region, Ukraine, Wednesday, May 24, 2023. Russia's military said Tuesday it quashed what appeared to be one of the most serious cross-border attacks from Ukraine since the war began, claiming to have killed more than 70 attackers in a battle that lasted around 24 hours. (Photo by Evgeniy Maloletka/AP Photo)





A Ukrainian soldier patrols at the frontline as Ukrainian Army conduct operation to target trenches of Russian forces through the Donetsk region, where the country's most intense clashes occur, amid Russia and Ukraine war in Donetsk, Ukraine on May 09, 2023. (Photo by Muhammed Enes Yildirim/Anadolu Agency via Getty Images)