This is at best a conjecture. It's arguable what terms are acceptable and to whom, but Russia has offered and is offering substantially milder terms than taking all of Ukraine. They probably wouldn't even want western Ukraine if offered.
>Immigrant to Europe
To me, this reads as a banal attempt at doxxing, since you have assumed yourself the position of arbiter of moral authority, which is being challenged by my assertions - but since you choose to frame things in this context, I can say with positive certainty that my cosmopolitan, multi-national, multi-language lifestyle, carried on over 4 decades, has well and truly led me to what I consider to be an elevated position: that all cultures are arbitrary and choose war instead of peace overtly, and often blindly.
The narrative that "all Russians are bad" or that "Russia can never be trusted" is as banal as the narrative - although equally 'true' - that "all Americans are bad" and that "America cannot be trusted", also. The simple fact of the matter is, I know plenty of great Russians. And Americans. And Iraqis', and Afghani's, and Kurds and Israeli's and Iranians and Egyptians and a few great Brits, a very hilarious Yemeni family (also immigrants), and a handfull of other wonderful people, on the other side of the _label_.
Russia and Ukraine are in the mess they are in because their arbitrary cultures are perpetuating the hatred, like you, instead of postulating peace and prosperity, like me.
The simple fact is, our current set of nations, equally human, is currently too incompetent to attain the wishes of the greater human entity, which exists well and truly beyond the sphere of those claiming that "mouthpieces of Russian propaganda" are something to be worrying about.
And the reason for that incompetence is, in my well-travelled and -spoken opinion, due to one factor only: the laziness of those who would use "those of another culture, over there", to manifest their own self-hatred. Because, as an American, you must surely, surely understand that there is a growing stack of reasons for the rest of the world to hate America right now - and yet, here we are, having a civil discussion about the state of things.
It is my learned opinion that there are no greater or lesser, more inferior or superior cultures - that all humans have the same constraints hefted upon them in greater or lesser magnitude, and those of us who have the freedom of expression and travel to maintain a multi-cultural, cosmopolitan lifestyle, must never submit to those incapable of escaping the propaganda and hubris of their own mono-culture.
All culture is a lie, which only persists in the re-telling. "Russians are evil" and "Americans are evil" are lies, persisted by those who re-tell them, designed to keep Russians and Americans from doing great things, together.
And if you think this isn't applicable, in every single human case tested so far, then you need to travel more. And not as a tourist: as a local.
It's the only way to be sure you know what you're talking about with regards to world affairs...
Ukraine certainly could have chosen to accept Russia's demands, but the demand was essentially the extinguishment of soverign Ukraine, and the extinguishment of Ukrainian identity. At least, those were the demands I saw.
Not a lot of diplomatic room. Also, Ukraine had engaged diplomatically with Russia in the past, but it turns out there's no mechanism for Ukraine to enforce treaties that Russia signed.