"Our only luck was that my wife was in the kitchen, so the flying glass did not hit her," Volodymyr said, who lives with his wife only a few meters from the epicenter of the explosion.Fearing a return of Russian occupation to his increasingly bombed-out front-line city in Ukraine's northeastern Kharkiv Oblast, Volodymyr refused to provide his full name.The 1.5-ton thermobaric bomb that Russian troops dropped next to the shopping center at the edge of the city killed a 73-year-old woman and injured others.The use of such destructive weapons against civilians marks the Russian army's upscaled push to occupy the latest Ukrainian city, enduring more suffering and uncertain prospects.One recent Russian strike on Kupiansk disrupted central water supplies throughout the city, forcing the people left in the city, most of them retirees, to roam streets carrying buckets from wells to their homes.