Is Russian group APT28 behind the cyber attack on the German air traffic control agency (DFS)?

https://securityaffairs.com/168070/apt/apt28-cyber-attack-german-air-traffic-control-agency-dfs.html

https://twitter.com/home/status/1831637235541692627

https://twitter.com/home/status/1831638430050394585

https://twitter.com/home/status/1831643660745683192