Interesting point to illustrate, why wikipedia's articles are not as good as the scientific ones. Because don't you think, this truth is a matter of perspective?

Because to my understanding, a real war between Ukraine and Russia would look a bit different and would have been over long ago.

There are definitely strong elements of a civil war, despite russias covert and open engagement. And with the US and EU involvment on the pro west Ukrainian side - it is complicated geopolitics. Hard to find simple truths there, when all involved sides are engaged with disinformation and propaganda.