Russian soldiers in April in downtown Mariupol, Ukraine. There is growing recognition among Russians that their military was woefully underprepared for major conflict.Credit…Sergei Ilnitsky/EPA, via Shutterstock Natalia Abiyeva is a real-estate agent specializing in rental apartments in the city of Nizhny Novgorod, east of Moscow. But lately, she has been learning a lot about battlefield medicine. Packets of hemostatic granules, she found out, can stop catastrophic bleeding; decompression needles can relieve pressure in a punctured chest. At a military hospital, a wounded commander told her that a comrade died in his arms because there were no airway tubes available to keep him breathing. Ms. Abiyeva, 37, has decided to take matters into her own hands. On Wednesday, she and two friends set out in a van for the Ukrainian border for the seventh time since the war began in February, bringing onions, potatoes, two-way radios, binoculars, first-aid gear and […]