A Ukrainian drone attack killed a mother and her toddler in western Russia on Wednesday, local officials said, in a major overnight barrage that set an oil refinery ablaze and targeted a nuclear facility.

One of the uncharacteristic attacks targeted the Nizhny Novgorod region, located southeast of Moscow and about 800 kilometers from the Ukrainian border. The Russian Defense Ministry said it shot down three drones over the region. Governor Gleb Nikitin said drone fragments damaged a building and caused a fire, but did not hurt anyone.

Ukrainian drones have launched a series of attacks on oil refineries and power infrastructure in western Russia, with one strike reportedly targeting a nuclear facility