Written by Carlotta Gall and Ivor Prickett Russian troops spent weeks searching for Mariya, the 65-year-old common-law wife of a serving Ukrainian army officer. Twice, she said, they ransacked her cottage in a village outside the town of Balakliya, Ukraine, and when they did eventually detain her months later, they tortured her repeatedly under interrogation, using electric shocks and threats of rape. The recapturing by Ukrainian fighters of much of the Kharkiv region a month ago is now revealing what life was like for thousands of people living under Russian military occupation from the early days of the war. For...