DNIPRO, Ukraine — Around 1:30 a.m. on December 6, an explosion woke me at my mother’s apartment on a central street in my hometown, where I’d fallen asleep to the wail of an air-raid siren. The blast sounded close, and it was followed by waves…

DNIPRO, Ukraine — Around 1:30 a.m. on December 6, an explosion woke me at my mother’s apartment on a central street in my hometown, where I’d fallen asleep to the wail of an air-raid siren. The blast sounded close, and it was followed by waves…