Guardian journalists were just around the corner when a Russian drone hit a residential building in Kramatorsk, in the Donbas region of Ukraine. Subscribe ► https://www.youtube.com/user/theguardian?sub_confirmation=1 Peter Beaumont, a senior international reporter, is on the ground in the “fortress Belt” of eastern Ukraine, where for years a costly defensive strategy has prevented Russia making a major breakthrough to territory further west. Cities such as Kramatorsk form one of the main