Air traffic in parts of Northern Europe was severely disrupted on the evening of September 22 after unidentified drones were spotted near major airports in Denmark and Norway, prompting full closures of airspace in both capitals. Later in the evening, additional drones were spotted above Oslo’s Gardermoen Airport. Just last week, German Eurofighter jets intercepted a Russian reconnaissance plane flying over the region. Officials in both Denmark and Norway stressed that public safety required immediate closures while the drone activity was assessed. Denmark, Norway, and Sweden - staunch NATO members and key supporters of Ukraine - have all pledged to respond firmly to any further violations of their airspace.