Denmark said on Thursday that drone incursions overnight, which briefly closed two airports and affected military installations, were hybrid attacks aimed at spreading fear, though authorities could not identify the perpetrators. The incident, the second in two days in Denmark alone, is part of what some European officials see as a pattern of Russian disruption that has exposed the vulnerability of European airspace at a time of high tensions between Moscow and NATO. Poland shot down suspected Russian drones in its airspace on Sept 10. Danish authorities said on Thursday they decided not to take down any of the drones in their airspace for safety reasons, despite the disruption caused to air traffic. Russia's embassy in Copenhagen rejected as "absurd"...