Russia said Sunday that a drone had struck an "industrial enterprise" east of Moscow overnight, after Ukraine reported hitting a major oil refinery.
"A massive drone attack is under way in the Nizhny Novgorod region overnight and this morning, with more than a hundred drones destroyed," regional governor Gleb Nikitin said in a statement.
"According to preliminary information, there are no casualties. An industrial enterprise in the Kstovo district sustained significant damage," he added, without giving further details about the plant's activities.