Tamara Smoliarchuk mourns at the grave of her niece, Olena Kyrpychenko, a teacher who was killed Friday by Russian shelling, in the main cemetery in the southern Ukrainian city of Kherson, May 9, 2023. (Finbarr O’Reilly/The New York Times) At the very end of April, the bus crosses the Ukrainian border, passing fields of muddy furrows, fawn corn stubble and standing water. Suddenly it’s clear why the spring offensive has been delayed. A sweeping wind greets us every time passengers disembark. I’m sitting next to 20-year-old Nastia, who took the chance to escape Kyiv last April with her boyfriend to...