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. Ukraine’s air defence reported that it repelled numerous Russian attacks on Saturday night, destroying 15 of 23 drones and one of four missiles. It said the regions of Odessa, Kharkiv and Dnipropetrovsk were ta…