I think the important thing is that they get some stability and can set out a course for the future, and stick with it for 10-15 years so things improve. But that's impossible if everybody is sidetracked with quarelling about language, pro-West or Pro-Russia and dramatic changes in government on a regular basis.

This has happened before, so what's the guarantee it won't happen again..

The two groups in the country have different loyalties. Either you have a dictatorship that forces them to work together whether they want to or not, or allow them to split up in such a way that both sides get what they want, separately.

And they can't have a trade union and visa union with Russia and EU at the same time.
And they cannot expect to get subsidised energy from Russia while running the errands of the EU and USA.
Half the country cannot join the EU and the other be close to Russia, even if it's a federation.

I am afraid this is an endless loop of events; pro West, pro-Russia, Pro West, Pro Russia infinitely.
"He who does not remember history is doomed to repeat it."
They've been through this cycle 3-4 times now, there are no winners other than corrupt crooks and multinationals. The losers are Ukrainians, all of them...