Ukraine fired dozens of drones at Russia between late Wednesday and early Thursday, wounding three people and sparking fires in two southern regions, including at an oil refinery, officials said.

Ukrainian drones targeted the Unecha oil pumping station, part of the Transneft Druzhba pipeline network, sparking a large fire, an intelligence source told the Kyiv Independent.

Ukrainian forces are increasing the intensity of long-range drone strikes deep into Russia ahead of Friday's planned meeting between Presidents Trump and Putin.