倒计时48小时，欧洲恐被一锅端？悬在头顶的炸弹，到底是谁干的

Group 1 - The recent appearance of unidentified drones over multiple European countries has raised security concerns, prompting Denmark to implement a nationwide drone flight ban for five days [1][3] - The Danish government has taken decisive action by enhancing airspace monitoring with the assistance of the German Navy, as a significant EU security meeting is scheduled in Copenhagen [1][3] - Security experts believe that the drone activities are a serious threat, particularly as they have been spotted near military bases and border posts, indicating a potential espionage motive [3][4] Group 2 - There are speculations regarding the origin of the drones, with many experts attributing them to Russian involvement, while others suggest they could be linked to Ukraine or NATO as part of a strategic maneuver [4][6] - The EU is considering accelerating the implementation of a drone defense plan, which aims to deploy advanced monitoring and interception systems along the eastern borders [7] - Security measures in Copenhagen are being intensified ahead of the summit, with armed police presence and strict flight controls affecting commercial air traffic [9]