The Ukrainian soldier warns me to speak no louder than a whisper. The enemy lines are less than 50 meters away, he tells me, and my voice — if too loud — can easily carry across no man’s land and invite gunfire from the other side. “We see each other, and we shoot at each other every day,” says the soldier, whose name is Mykhailo. “Everyone is afraid … we are afraid, and the Russians are afraid of us.” We’re standing at one end of a ruined factory on the outskirts of the city of Avdiivka in Ukraine’s eastern war...