At least two people have been killed and four others injured in Russian airstrikes on the north-eastern Ukrainian city of Sumy, authorities said on Sunday. The victims were an elderly couple whose house was destroyed overnight, with a 2-year-old girl and an 8-year-old boy among the injured. The border city of Sumy has seen repeated assaults since Russia invaded Ukraine in February 2022. Ukrainian President Volodymyr Zelensky said on Sunday morning that Russia has fired more than 800 guided aerial bombs, almost 300 drones and more than 60 missiles at his country in the past week alone. “Terror …