For weeks, Viktor has barely slept as Russian drones and artillery continually target his position. During the day, he watches for any attempts by Russian troops to cross a minefield that separates the two sides. At night, he picks up a shovel to dig and fortify his trench.

“They’re constantly firing, constantly probing,” he says. “We have to survive somehow and we have to hold the line.”

It is the start of another draining day on Ukraine’s eastern front line. Monitoring his scratchy radio, Viktor will try to move as little as possible in a trench less than 800 meters from where Russian soldiers are amassed. For seven months, Viktor’s unit has held this sector of the front, repelling a relentless onslaught of Russian assaults.

Now in the third year of full-scale war, Ukraine’s top military leaders openly admit that the battlefield situation on the eastern front has deteriorated. Two years of war have sapped Ukraine’s ammunition and manpower, while the country’s failed counter-offensive last year sank morale.

As Reuters traveled along the eastern stretch of Ukraine’s 1,000-kilometer front line in April, soldiers in infantry, artillery and drone units all expressed exhaustion. They spoke of an acute shortage of ammunition and an urgent need to replenish troops. A new push by Moscow earlier this month near Kharkiv, Ukraine’s second-largest city, is likely to further divert precious ammunition and personnel from other sections of the front, stretching Kyiv’s military thin at a critical moment in the war.