Regarding the Donbas regions... the only solution is ONE MORE TRY — A referendum monitored and supervised by international observers for fairness.
The referendum question : What do you want your place to be?
A. Russian
B. Ukrainian
C. Independent
Let the people of Donbas decide what they want for themselves.
a referendum would be a good solution.
including the east of Dnipro river area, south and Odessa regions for separate referendum is good too. The western third of polish catholics (forner galicia) deserve their choice too.
All good solutions (better than bullets) but hard to implement.