The gas station, the last major roadside stop before the Ukrainian front lines 50 miles away, was buzzing. Soldiers squeezed beside civilians as cashiers yelled out order numbers, sliding hot dogs across the counter. Once mere pit stops, gas stations are now pillars of Ukraine’s war effort. The station, in the eastern city of Pavlohrad, has become a ritual stop on his way to or from the front, a place to stock up on cigarettes and get a bite. His favorite gas station, he said, was one in the embattled eastern city of Kostiantynivka, which became iconic among soldiers for having stayed open even as fighting raged nearby.