An American fighting for Ukraine who served in the U.S. Army with combat tours in the Middle East described the constant Russian bombardment of the city of Severodonetsk in Ukraine’s Donbas region as “the closest thing I’ve ever seen to hell.”…

“We lost three guys,” after fighting near Severodonetsk, the soldier said. “My commander got killed out there. A buddy of mine got killed out there. When s— like that happens, it’s hard to imagine the way forward.”

The Ukrainian losses have been steep: as many as 100 to 200 casualties per day at the worst points in the war, according to Ukraine’s own estimates. These brutal losses have eroded morale within the ranks and in other units, five non-Ukrainian soldiers said in interviews over the past month. Four of the soldiers have not made their identities public and asked that their names not be used out of concern for their security and so they could speak freely about their experiences.

“The number of people that are upset and have low morale has increased, and that’s partly because of the way the Russians have chosen to fight,” Ripley Rawlings, a retired U.S. Marine Corps lieutenant colonel and author, who is providing supplies to foreign fighters in Ukraine through his U.S.-based organization, Ripley’s Heroes, said.