Umm, that's a huge assumption. It couldn't be nearly that bad, considering Ukraine's most recent election results, welp, if majority of Ukrainians regretted the pro-western turn, they could have voted in the pro-Russia party again. They didn't, not even close, the pro-Russian president candidate didn't even get to second round. In conclusion, either it's not nearly as bad as you picture it, or if it is, Ukrainians themselves still consider that worth it.
So, lets check that with the facts:
So facts are, economically at least, its not "orders of magnitude worse than they already were", the reality is that they were in stagnation since the 2008 crisis, the Euromaidan, war, and breaking off ties with Russia merely took few percent off their GDP, and they have recovered that since then.
In terms of HDI rather than pure economics, in fact it seems Ukraine is slightly better off.
Ukraine: Human Development Index (0 - 1): For that indicator, we provide data for Ukraine from 1990 to 2021. The average value for Ukraine during that period was 0.713 points with a minimum of 0.661 points in 1996 and a maximum of 0.779 points in 2020. The latest value from 2021 is 0.773 points...
www.theglobaleconomy.com
So no, Ukraine definitely is not a Syria style scenario.
Probably. But lets not forget that the Donbass separatists were tools for Russia. Russia doesn't care that much about getting a small piece of Ukraine and its population, its way more interested in the whole thing. The plan A was to get Ukraine into Russia mediated negotiations with the separatists, which in turn would be guided to make Ukraine give certain autonomy to the regions, alongside other perks promises in international policy
that would include Russia's main objective of being stuck having close relations with Russia no matter the cost, and in turn limited relations with the west. Probably also "funny" election business in the newly autonomous regions. Basically the separatist regions and threat of civil war they pose would be used as a handle to control whole Ukraine with.
But the other side didn't cooperate with the plan and instead let Russia to do its worst, and turn the place into effectively unrecognized states with semi-formal Russian support.
Now the handle is kinda detached from the object it was supposed to be used for handling. Still, it has some of the benefits it was supposed to have - having a semi-frozen conflict like that considerably complicates Ukraine's perspectives for EU and NATO membership.
And that's the plan B. Which also shows the priorities in what Russia really cares about regarding Ukraine. Hint: Ukrainian's well being is not very high on that list.
But why should they? It would be completely unreasonable realpolitik wise. Why should EU and USA bail out Russia's cronies? Are they meme Sweden or what? Russia is a big country, it can bail out its own cronies, satraps and buddies if it wants to. EU and USA meanwhile can stick to bailing out their own, they sure do plenty of that.