At FAZ I would follow the author Johannes Leithäuser. A few other suggestions would be the publictions of Stiftung Wissenschaft und Politik, Gesellschaft für Sicherheitspolitik, IPG Journal, the newsletter Sicherheitspolitische Presseschau, and the blog Augen Geradaus. But all those are pretty specialized. Unfortunately I don't know any mainstream source where one would have noticed this story. There are also some interesting political science journals but I don't follow any.
If I could only add one thing to my daily reading list it would be that mentioned newsletter. And of course I would read the Bundeswehr Weißbuch.