Like in any "asymmetrical war", as the US, USSR, China learned in Afghanistan, Vietnam, Iraq "it is not over, until is over".
The occupation of the territory means nothing, and is only the first phase of war, as the guerrilla war starts. In this type of war the technical supremacy means noting, especially as the guerrilla forces will be locally and internationally supported with intel, shelter, food, and weapons. As coffins/ body bags start arriving, Russia's will to fight "someone else's war" will be questioned. Ukrainians have a very strong motive to fight as their homes and their lives are threatened, so IMHO, the aggressor will always loose - but be prepared for a long war.