Ukraine's military has conducted massive drone attacks against Russia following Russian drone intrusions into the airspaces of Ukraine's neighbors.



The Ukrainian General Staff of the Armed Forces announced on Sunday that drones struck an oil refinery in the northwestern Russian region of Leningrad.



Ukraine's President Volodymyr Zelenskyy thanked all Ukrainian soldiers for "inflicting really significant losses on Russia."



Russia's defense ministry said its forces had shot down more than 360 Ukrainian drones.



The Ukrainian air force said the Russians attacked with a missile and more than 50 unmanned aerial vehicles, including drones.



Russia came under criticism when its drones intruded into the airspace of Poland, which shares a border with Ukraine, from Tuesday through Wednesday last week.



On Saturday, Romania, which also borders Ukraine, reported that a Russian drone had breached its airspace.



Observers say tensions in the region could heighten further.