Russia launched a massive attack on Ukraine overnight into Saturday with hundreds of drones, killing at least one person, part of a stepped-up bombing campaign that has dashed hopes for a breakthrough in efforts to end the more than 3-year-old war.

A Russian drone attacked Sumy, damaging residential buildings and the power grid. A mother and son asked for medical assistance, according to the head of the Sumy regional military administration, Oleh Hryhorov.