But I don’t think it’s terrorism. Terrorism usually has a few criteria: not a regular army, and typically don’t use heavy military equipment but rely on guerrilla tactics and aim to terrorize because they are incapable of taking over a territory —because of a lack in numbers for control.
They would also qualify if they “export” terror by training, providing comfort and logistics to terrors groups. Maybe the latter applies more than the former. Though a few other countries could easily be labeled as such too.
But again it likely depends on how widespread and sanctioned or ignored by superiors these tactics are in the current conflict.
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?
Unfortunately, since the latest war the deny-list has grown substantially (making it a bit difficult to ensure you aren't accidentally servicing someone involved with a sanctioned entity), combined with political pressure this prompted some businesses to go an extra mile and cease operations in Russia completely.