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All you are saying is that Ukraine asked for freedom from Russia. And Russia gave it to them. Then when certain oblasts (provinces) in Ukraine asked for freedom from Ukraine, Ukraine wouldn't give it to them. Not fair, right?
So, these oblasts asked for help from Russia, and mostly when the Ukraine military started killing them and destroying their property. Russia obliged them, and for Russia's own reasons as well.
Ukraine lands can remain Ukraine lands. It's just that these oblasts are not Ukraine lands, just like Crimea that was once a Ukraine land, now is not.
With Zelensky continually plotting war, soon almost all of the oblasts will become non-Ukrainian, by designation of the people who live there. The people are rioting against Z already. If these people call to Russia for help, Russia will go even further than the chunk they wrested from Ukraine control already. Why? Because that is the way Russia is... freedom-minded for all people.
I remember that Ukraine ruined itself by handing over its nuclear weapons to Russia in exchange for its borders and security. It was not a smart move, because you can't trust the Russians with their imperial mentality. Now Ukraine has to arm itself to drive the Russian invaders off its land.
Wrong. Such was the only smart move. It kept Russia from taking the Black Sea Corridor (BSC) back then. And it staved off the military damage that Ukraine wanted to do to the peoples of the BSC who wanted to form their own nations away from Ukraine as the UN allows.
The result is that the BSC has become Russian land. Whether or not the peoples of the BSC will form their own nations when Zelensky and his Western Europe puppet masters are finally put down, is still a question. They might simply decide to join Russia, formally.
The BSC is not Ukraine any longer. It is Russia, now. Z is simply trying to take Russian lands away from Russia. Soon cartographers of the world will wake up to this fact and start changing their maps.