KHARKIV, Ukraine — Down in the cold, dark basement, the walls are decorated with Eastern Orthodox icons, a poster of Princess Diana and shelves filled with stuffed toys. Sheets with animal prints serve as improvised doors for more privacy. Beds are thin pads on wooden crates. Pots, pans, a color-changing lamp and even an air fryer were eventually brought in as the stay grew from days to weeks to more than two months. Outside, a woman filled a tire with mud — a little garden for her onions.