This is the 6638th most frequent Polish word.
donbasie
"Donbasie" is the locative case of "Donbas," referring to the Donbas region in Ukraine.
The word 'Donbasie' is the locative case of 'Donbas', indicating location.
W Donbasie sytuacja była napięta.
In Donbas, the situation was tense.
Though here 'Donbasu' is the genitive case of 'Donbas', it contrasts with 'Donbasie' as it is used to express possession or association.
Mieszkańcy Donbasu borykają się z wieloma problemami.
The residents of Donbas face many problems.
The use of 'Donbasie' again indicates location and relates to a specific happening in that area.