By Lizzie Johnson and Kamila Hrabchuk IZYUM, Ukraine — Newly 16, she likes to walk alone, hands shoved in pockets, music loud in her ears, for mile after mile. If Kate Kobets walks far enough, she can escape into her own world. It is a place where her childhood hasn’t been destroyed — her home loud with war, her soldier stepfather locked away as a Russian prisoner of war, she and her mom...