A group of relatives of Ukrainian prisoners of war gathered at a rally in Kyiv on Tuesday to remember their loved ones as the full-scale Russian invasion reached its 1,000th day.

A thousand days of war in Ukraine have been captured in stunning images, many of them horrifying, some of them poignant, others uplifting. Since Russia’s all-out invasion of its smaller neighbour on Feb. 24, 2022, Europe’s biggest armed conflict since...