Ukraine’s Constitution bars ceding #territory other than through a nationwide referendum. A recent poll by the Kyiv International Institute of Sociology found that 78% of Ukrainians were against transferring territory controlled by #Ukraine to #Russia.
The Kremlin typically sees the #Donbas as comprising the Donetsk & Luhansk regions in eastern Ukraine. Moscow has taken nearly all of #Luhansk, but despite trying for more than a decade, it hasn’t managed to wrest control of the #Donetsk region.