Ukrainian servicemen from the Liut Brigade monitor the situation on the battlefield near Chasiv Yar, in the Donetsk region of Ukraine, Wednesday, May 15, 2024. (AP Photo/Evgeniy Maloletka)
Russian rockets are launched against Ukraine from Russia's Belgorod region, seen from Kharkiv, Ukraine, Saturday, May 18, 2024. (AP Photo/Evgeniy Maloletka)
CORRECTS SPELLING OF DATELINE TO KHARKIV INSTEAD OF KHARKOV - Ukrainian national guard servicemen from the Khartia Brigade fly a "vampire" drone while bombing Russian positions at the front line near Kharkiv, Ukraine, Friday, May 17, 2024. (AP Photo/Evgeniy Maloletka)
CORRECTS TYPO IN DATELINE FROM KHARKOV TO KHARKIV - Ukrainian national guard servicemen from the Khartia Brigade attach an explosive to a "vampire" drone before bombing Russian positions at the front line near Kharkiv, Ukraine, Friday, May 17, 2024. (AP Photo/Evgeniy Maloletka)
A Ukrainian Mi-24 helicopter returning from a combat operation at the front line in Ukraine’s Kharkiv region, Sunday, May 19, 2024. (AP Photo/Evgeniy Maloletka)
A Ukrainian soldier from the 24th Brigade prepares mortar shells at the front line in Ukraine’s Donetsk region, Sunday, May 19, 2024. (AP Photo/Evgeniy Maloletka)
FILE – A destroyed resort compound is seen from above after a Russian rocket attack near Kharkiv, Ukraine, Sunday, May 19, 2024. According to officials, 6 people were killed in this attack. (AP Photo/Evgeniy Maloletka, File)
Ukrainian Mi-8 helicopters returning from combat operation at the front line in Ukraine’s Kharkiv region, Sunday, May 19, 2024. (AP Photo/Evgeniy Maloletka)
A Ukrainian soldier from the 57th Brigade waits for an order for his artillery vehicle to open fire on Russian positions at the front line in Ukraine’s Kharkiv region, Sunday, May 19, 2024. (AP Photo/Evgeniy Maloletka)
A Ukrainian artillery vehicle from the 57th Brigade fires towards Russian front-line positions in Ukraine’s Kharkiv region, Sunday, May 19, 2024. (AP Photo/Evgeniy Maloletka)
A Ukrainian soldier from the 57th Brigade loads an artillery shell to fire on Russian positions at the front line in the Kharkiv region of Ukraine, Sunday, May 19, 2024. (AP Photo/Evgeniy Maloletka)
A Ukrainian soldier from the Liut Brigade fires an Msta-B artillery toward Russian front-line positions near Chasiv Yar, in the Donetsk region of Ukraine, Wednesday, May 15, 2024. (AP Photo/Evgeniy Maloletka)
FILE - Ukrainian soldiers who just came from battle stand near an ambulance at a 47th Brigade field hospital near Avdiivka, in Ukraine’s Donetsk region, on Friday, May 10, 2024. (AP Photo/Evgeniy Maloletka, File)
Ukrainian soldiers from the 57th brigade rest at their positions at the front line in Kharkiv region, Ukraine, Sunday, May 19, 2024. (AP Photo/Evgeniy Maloletka)
FILE – Viter, a doctor with Ukraine’s 47th Brigade, treats an injured comrade at the field hospital near Avdiivka, in the Donetsk region of Ukraine, on Friday, May 10, 2024. (AP Photo/Evgeniy Maloletka, File)
A Ukrainian soldier from the 57th Brigade walks to his front line position in Ukraine’s Kharkiv region, Sunday, May 19, 2024. (AP Photo/Evgeniy Maloletka)