The Donbas Euroregion covers the Donetsk and Luhansk regions of Ukraine, and also Rostov area of Russian Federation.
Donbas is currently the most densely populated of all the regions of Ukraine (excluding the capital city of Kiev).
The city of Donetsk is considered the unofficial capital of Donbas
On Saturday, a Donetsk Republic flag was raised at the Donetsk city administration building, as the anti-Maidan rally took place in the city, showing their support for independence of the Donetsk Region.
Slavyansk has become the focus of Ukraine's Putsch government with Ukrainian helicopters and military sent to suppress the rebellion of Donbas Militia in Slavyansk - reports of three people injured in fighting with Kiev Putschist forces.
Local residents said several transport helicopters landed at an old airfield some 5 kilometers from the town center.
Troops wearing black uniforms disembarked and went toward Slavyansk.
The shooting reportedly started at a checkpoint, which was established by protesters Saturday evening on the outskirts of the city.
At least three people, including one civilian, have been injured in the fighting and have been taken to the local hospital, some reports claim.