In describing the difference between Russian and Western doctrinal views on the role of artillery, the Royal United Services Institute puts it succinctly:

‘Russian forces manoeuvre to fire, Western forces fire to manoeuvre’ is a neat encapsulation of Russian doctrine compared with the West. Put simply, Russia uses artillery as its primary form of lethality in the deep and close battles.

You could replace the word “Russian” with “Ukrainian” and it would neatly express the switch in tactics.