Isn't Russia always prepared for war? I don't think the concern is some sort of cold war era major offensive where Russian tanks storm forward and take territo

Isn't Russia always prepared for war? I don't think the concern is some sort of cold war era major offensive where Russian tanks storm forward and take territory. The modern approach seems to be stirring up local trouble/guerrilla warfare/slow escalation/bringing in some (elite?) forces to bear locally to make progress. Generally with some local support. If the author's point is something along the lines of Russia isn't set up right now for a major offensive to conquer the entire Ukraine in a week that's sort of a moot point I think? They don't need that to completely destabilize things, saw some chaos, and eventually in the medium term take over without resorting to a full scale attack. There's plenty of examples of Russia being able to shift resources around pretty quickly. How much does it really take to destabilize Ukraine to the point where they'll get invited in?