European Union and NATO member Latvia issued an air threat alert for some of its eastern parts that border Russia and Belarus, its Armed Forces said on X/Twitter on Friday.

Less than an hour later, it ended the air threat alert, stating that allied fighter jets had shot down a drone in its airspace.

Finland, which also shares a border with Russia, imposed a temporarily restricted area for aviation and maritime traffic in the eastern Gulf of Finland, its defense forces said on X.

Latvia's armed forces did not immediately provide details about the drone or its origin.

Countries neighboring Russia and Ukraine issue air threat alerts and down drones from time to time as Moscow and Kyiv continue to exchange attacks after Russia's full-scale invasion of Ukraine in February 2022.

Overnight, Russia shot down 15 drones in the Leningrad region, close to Finland and Estonia and home to St Petersburg, the country second biggest city and a major export hub, regional governor Alexander Drozdenko said on Telegram early on Friday.

Russia's northern NATO neighbors are tightening security around dams, power plants and natural gas infrastructure in a sign of mounting concern that Moscow will stage a "false flag" attack on them using Ukrainian drones.