Moscow, Nov. 9 -- Ukrainian drones struck Russia's second-largest oil refinery in Kirishi in the Leningrad region during an overnight attack, triggering large explosions and fires at the facility.

Meanwhile, Moscow claimed that its air defence systems had downed 81 Ukrainian unmanned aerial vehicles (UAVs) over the region, Russian news agency TASS reported.

The attack reportedly targeted the Kirishi Petroleum Organic Synthesis plant, also known as the Kinef refinery, located around 800 kilometres north of Ukraine. The Kyiv Independent reported, citing Ukrainian monitoring channels Exilenova+ and Supernova+, that the strikes caused large explosions at the oil facility.

NASA's Fire Information for Resource Management System (FIRMS), whic...