Does "full scale" mean invasion and occupation of the whole country? Up to the Polish border?
Yes -- conquest of the entire country and capturing the capital is what I define as a mass invasion. It's something which is suggested as a scenario every day in the media.
Previous incursions have been limited in their scope and scale, as we have seen. Large numbers of those in the extreme east (currently occupied) are pro-Russian hence why the conflict still rumbles on. If Putin does anything, it will involve taking the currently occupied areas and possibly linking Crimea to Russia proper. I don't think he will though.
Now the terminology is clear, I reiterate that there will be no mass invasion.