I would disagree.
I don't think Putin "forgot" to cut off communications in Ukraine. I think he deliberately did that.
Ukrainians, Poles, etc are very predictable people in their own media. Putin knew what they are going to do: using propaganda to make Russians look weak and ill-prepared, create for the social-media world an image of a winning Ukraine and a losing Russian forces.
In my own Chinese perspectives, this is very understandable: "借敌人之手懈怠敌人".
若欲使其灭亡,必先使其疯狂。(I don't know how to translate these accurately to English)
In fact, Putin's tactics might be very risky gamble. But so far, he did the right thing.
Just like how the whole attack against China because of the "taking in Ukrainian girls" media warfare (done by Taiwanese and other oversea 反贼)to target China ended up backfiring.
You guys (westerners) think in very straight black-or-white manners. I, for example, don't really think it was a bad thing for Russia to appear weak and full of failure on the global social media. Because this gives the world (as well as Ukrainian nationalists) a false image of Russia and the whole event. You want the enemy to think they are winning. Especially in Ukraine where the general consensus of people is that they are sick tired of war.