KYIV (Reuters) -Overnight Russian air attacks wounded eight people, set a private business on fire and damaged residential buildings around Ukraine, local officials said on Tuesday. Ukraine's air force said it shot down 65 drones and 28 more did not reach their targets in the barrage.

Two people were killed and as many others were injured in an overnight Ukrainian drone attack on Russia's Belgorod region, Governor Vyacheslav Gladkov said on Wednesday.

Ukrainian drones hit an oil refinery 250 miles east of Moscow in a huge wave of attacks on Russian power plants, say military sources. A large fire exploded at the refinery in Kstovo city in the Nizhny Novgorod region following the attack, the Ukrainian military said, adding it was assessing the scale of damage there.