Excuses excuses. It’s not exactly the height of military intelligence to notice the build up, the endless news stories, movement of equipment, signals Intel etc. This is just Zelinsky with another “stab in the back” story to explain his incompetence. Glad the Reich is losing.
That was my take. Electronic and satellite surveillance is so sophisticated now it would be impossible to stage a large land based offensive without the other side knowing what you are going to do.