I understand the need to be careful but when you have widespread reports of execution and rape of civilians in all the areas being invaded by Russia (i.e. all 3 fronts) it seems to be more of a pattern than an exception.
Look, there is no denying war atrocities. But all conflicts have them to one degree or another. If we go by the definitions above, then most allies (and foes) have engaged in terrorism too, including ourselves and then the distinction the term provides disappears.
Let's look at it from another angle. In order to submit the people of Ukraine, has Russia taken out all the stops? Do they have other more lethal and effective options?
But again it likely depends on how widespread and sanctioned or ignored by superiors these tactics are in the current conflict.