I think they've counted on the Ukrainian government (especially Zelensky and his closest circle) to give up the fighting and surrender early in the operation. Or have Ukrainian army overthrow him, Putin already suggested they don't need to take commands from this "narc" and "nazi" (btw Zelensky is jewish). It's either their intelligence is that bad (which I don't believe) or Putin just didn't listen, having some delusional picture of the current political and cultural state of Ukraine in his head.