Injured Ukrainian servicemen arrive from the battlefield at Medical Service "Ulf" of the 108th Separate Battalion "Da Vinci Wolves" on Pokrovsk direction, Ukraine, Monday, Dec. 23, 2024. (AP Photo/Evgeniy Maloletka)

A medic treats an injured Ukrainian serviceman at Medical Service "Ulf" of the 108th Separate Battalion "Da Vinci Wolves" on Pokrovsk direction, Ukraine, Monday, Dec. 23, 2024. (AP Photo/Evgeniy Maloletka)

An injured Ukrainian serviceman takes off his shirt after arriving from the battlefield at Medical Service "Ulf" of the 108th Separate Battalion "Da Vinci Wolves" on Pokrovsk direction, Ukraine, Monday, Dec. 23, 2024. (AP Photo/Evgeniy Maloletka)

An injured Ukrainian serviceman walks out of an ambulance at Medical Service "Ulf" of the 108th Separate Battalion "Da Vinci Wolves" on Pokrovsk direction, Ukraine, Tuesday, Dec. 24, 2024. (AP Photo/Evgeniy Maloletka)

A medic treats an injured Ukrainian serviceman at Medical Service "Ulf" of the 108th Separate Battalion "Da Vinci Wolves" on Pokrovsk direction, Ukraine, Monday, Dec. 23, 2024. (AP Photo/Evgeniy Maloletka)

Medics haul an injured Ukrainian serviceman on a stretcher from an ambulance at Medical Service "Ulf" of the 108th Separate Battalion "Da Vinci Wolves" on Pokrovsk direction, Ukraine, Tuesday, Dec. 24, 2024. (AP Photo/Evgeniy Maloletka)

A medic helps an injured Ukrainian serviceman walk out of an ambulance at Medical Service "Ulf" of the 108th Separate Battalion "Da Vinci Wolves" on Pokrovsk direction, Ukraine, Tuesday, Dec. 24, 2024. (AP Photo/Evgeniy Maloletka)

A medic checks the ear of an injured Ukrainian serviceman at Medical Service "Ulf" of the 108th Separate Battalion "Da Vinci Wolves" on Pokrovsk direction, Ukraine, Tuesday, Dec. 24, 2024. (AP Photo/Evgeniy Maloletka)