you seriously trying to make the case Ukraine forces are not warring in Mariupol - it take 2 to warThey also lived in Mariupol, which was majority Russian-speaking.
How do they feel about being protected by Putin now?
Mariupol is a Black Sea port. it's orienyed to export and import. The industry there is also extraction *if I recall)
the case of Donbas most work ( or did) in Russia and the lingua franca is Russia
They have familial ties, and are culturally Russia and the border Russia, not the sea
Donbas was seeking autonomy - not Mariupol