It's not about steamrolling, never was. The whole point of the exercise was to install a puppet government. In Ukraine, the TV actor installed by the Biden administration is currently the acting president. The moment funding runs out - so will he.
Being steamrolled requires Russia have the logistics to drive a steamroller more than a hundred yards. There is a reason it was intended to be a three day war.
Bombing a school is unconscionable but its a shadow of Russia's crimes in Ukraine.