Putin didn't really plan this. The yes-men did.
I don't think they are slow-walking this. They have exercised a bit of restraint, but I think they are moving as fast as their logistics and training allow. The shortfalls of Russian military capabilities have been inherited from the old Soviet army: get orders, stick to plan, and if something goes wrong, stick to plan no matter how obviously stupid the plan was.
Ran across this from a few months ago. I am decades past any fire and maneuver skillz, but this made me wince.
https://taskandpurpose.com/analysis/...ideo-problems/
"So many Russian conscripts are going to get smoked by Ukrainian futball moms who have a week of semi-professional small unit ambush training."-best comment