Ukrainian drone attacks have damaged an oil refinery in the Nizhny Novgorod region and oil transportation infrastructure near the Baltic Sea port of Primorsk, regional authorities said Sunday. A total of 87 drones were intercepted over Russia and annexed Crimea overnight, the Russian Defense Ministry said. Nineteen drones were downed in the skies above the northwestern Leningrad region, which is home to the major oil export hubs of Primorsk and Usta-Luga. Ukrainian drone attacks have damaged an oil refinery in the Nizhny Novgorod region and oil transportation infrastructure near the Baltic Sea port of Primorsk, regional authorities said Sunday. A total of 87 drones were intercepted over Russia and ann... [1490 chars]