Alina Kostenko awoke shortly before 5 a.m. to the sound of an explosion. She roused her husband, Oleksandr, who tried assuring her it was just a thunderstorm — which doesn't usually occur in Kyiv in February. "About five minutes later, we said, 'Let's go,'" Alina said. Friday marks one year since Russia invaded Ukraine. The office of the United Nations high commissioner for human rights reports more than 21,000 civilians have so far been killed or injured during the conflict, although the actual number of casualties is believed to be much higher. War crimes have allegedly been committed. Ukrainian service...