I grew up in a small town just outside London, and every Tuesday morning a WW2 air raid siren would go off, waking me from my slumber/hangover. To this very day, I know not why.

A version of this article appears in print on July 21, 2025, Section A, Page 4 of the New York edition with the headline: Air-Raid Sirens May Blare, But Ukrainians Still Wait At the Curb, Calmly.