I suspect that the Ukraine HAS SOMETHING that Russia wants for purely economic reasons, and "Justification" was never even a consideration in any of this fiasco. "Business" doesn't CARE about "morals", or "Right and wrong". Nothing matters but the bottom line.
It's been Ukranians ports in Crimea and mining operations in Ukraine. Not to mention the huge amount of groceries grown there in their flat areas with a much longer growing season than Russia.
The Crimean ports never freeze over in the winter the way the Russian ports do. Just a few pipelines and viola...Russia can sell more oil AND the Ukranian agricultural products must be sold to Russia for whatever price Russia wants to pay. Because Russian Oligarchs don't like paying market price for groceries. They sell them for market price or higher....but they have been strong arming Ukranian farmers for decades.
It came to a head after Russia sized Crimea in 2014. (They had a Russian Oligarch puppet as their leader) In response Ukranians cut off the main water supply to Crimea with a dam. (Their military was poorly equipped or trained at the time....but they have been preparing heavily since Zelinsky came into office.)
Russia has been heavily using disinformation and propaganda since Zelenski came into office with reports that he is a nazi (Zelenski is part jewish) that he uses drugs, is a thief, and all sorts of propaganda. Especially that those who speak Russian are poorly treated by Ukranians. (Russian Government gave Russians money to buy property and live in Ukraine...just so some would live there) Russia's initial assault was successful only because some Ukranian officials in Southern Ukraine accepted bribes. (Strong armed into it)
One of the prisoner exchanges recently was of a Russian Oligarch that was one of Putin's best friends that was in the government in Ukraine. (Smelling a rat yet?) Putin was in charge of the KGB....how does he even know anyone in Ukraine? How did this guy get get to be important in Ukraine?
Now that Ukraine has cut ties with Russia because they get treated better by the entire world outside of Russia....all of a sudden Russia invades. Go figure eh?