At least four people have been killed and 12 others injured in the eastern Ukrainian city of Kharkiv as a result of a heavy Russian drone attack, official reports said on Thursday. Governor Oleh Syniehubov and Mayor Ihor Terekhov announced on Telegram on Thursday morning that one resident and three rescue workers were among the dead in the residential area. The rescue workers had just been working at the impact site in the residential area when the Russian army attacked again. According to the authorities, several buildings were damaged, including a multistorey residential building, Terekhov w…