A Ukrainian serviceman of the attack drones battalion of the Achilles, 92nd brigade, operates a drone at his frontline position near the Russian border in Kharkiv region, Ukraine, on May 15, 2024. (Photo by Inna Varenytsia/Reuters)





Ukrainian servicemen of the 42nd Separate Mechanized Brigade place steel wire net on a 2S1 Gvozdika self-propelled howitzer to protect it from Russian drones at a position in a front line, amid Russia's attack on Ukraine, in Kharkiv region, Ukraine on May 16, 2024. (Photo by Valentyn Ogirenko/Reuters)





Servicemen of Ukraine's 93rd Mechanised Brigade fire a French MO-120-RT heavy mortar at the Russian forces on the front line near the city of Bakhmut in Ukraine's Donetsk region on Wednesday, May 22, 2024. (Photo by Iryna Rybakova via AP Photo)





A Ukrainian serviceman of the attack drones battalion of the Achilles, 92nd brigade carries a first-person view (FPV) drone before flying it near the Russian border in Kharkiv region, Ukraine, on May 15, 2024. (Photo by Inna Varenytsia/Reuters)





A service member of the 13th Operative Purpose Brigade 'Khartiia' of the National Guard of Ukraine carries a 152-mm shell to a D-20 howitzer to fire towards Russian troops at the frontline in Kharkiv, Ukraine on May 21, 2024. (Photo by Valentyn Ogirenko/Reuters)





Police officers inspect a neighborhood for evacuation of civilians on a village nearby Vovchansk City as Russian military offensive advances on north of Kharkiv region, Kharkiv Oblast, Ukraine, May 19, 2024. (Photo by Narciso Contreras/Anadolu via Getty Images)





Soldiers of the assault brigade defend the frontline, which passes through the Ukrainian boarder city of Vovchansk, in Chuhuiv Raion, Kharkiv Oblast, which is bombarded daily by heavy artillery on May 20, 2024 in Vovchansk, Ukraine. In recent days, Russian forces have gained ground in the Kharkiv region, an area that Ukraine had largely reclaimed in the months following Russia's initial large-scale invasion in February 2022. (Photo by Kostiantyn Liberov/Libkos/Getty Images)





Ukrainian servicemen of the 42nd Separate Mechanized Brigade wait for a combat work inside a dugout at a position in Kharkiv region, Ukraine on May 16, 2024. (Photo by Valentyn Ogirenko/Reuters)





A police officer runs in front on burning house destroyed by a Russian airstrike in Vovchansk, Ukraine, on Saturday, May 11, 2024. (Photo by Evgeniy Maloletka/AP Photo)





A Ukrainian soldier assumes position as the assault brigade defend the frontline in the Ukrainian boarder city of Vovchansk, in Chuhuiv Raion, Kharkiv Oblast, which is bombarded daily by heavy artillery on May 20, 2024 in Vovchansk, Ukraine. In recent days, Russian forces have gained ground in the Kharkiv region, an area that Ukraine had largely reclaimed in the months following Russia's initial large-scale invasion in February 2022.(Photo by Kostiantyn Liberov/Libkos/Getty Images)





A Ukrainian serviceman smiles on May 21, 2024 during a moment of calm in the southeastern town of Orikhiv, Zaporizhzhia, which has been heavily damaged by Russian military strikes. (Photo by Reuters/Stringer)





A Ukrainian serviceman washes his face after evacuating a wounded counterpart from the front line, near the town of Vovchansk in Kharkiv region, Ukraine, on May 12, 2024. (Photo by Vyacheslav Madiyevskyy/Reuters)





A Ukrainian serviceman of the attack drones battalion of the Achilles, 92nd brigade, attaches a shell to a first-person view (FPV) drone at his frontline position in Kharkiv Region, Ukraine, on May 15, 2024. (Photo by Inna Varenytsia/Reuters)





Ukrainian servicemen of the 92nd separate assault brigade load shells in an M109 self-propelled howitzer before firing towards Russian troops, amid Russia's attack on Ukraine, near the town of Vovchansk in Kharkiv region, Ukraine, on May 20, 2024. (Photo by Inna Varenytsia/Reuters)





Ivan Liashko, service member of the 13th Operative Purpose Brigade 'Khartiia' of the National Guard of Ukraine and a D-20 howitzer crew commander, fires towards Russian troops in a front line in Kharkiv Region, Ukraine on May 21, 2024. (Photo by Valentyn Ogirenko/Reuters)