The War in Donbass is an armed conflict in the Donbass region of Ukraine, part of the Ukrainian crisis and the broader Russo-Ukrainian War.

In the aftermath of the 2014 Ukrainian revolution and the Euromaidan movement, protests by Russia-backed anti-government separatist groups took place in the Donetsk and Luhansk oblasts of Ukraine, collectively called the "Donbass".

More than 13,000 people have died in the conflict, which dates back to April 2014, when the separatist rebels seized key areas of the Donetsk and Luhansk regions.

The rebels have Russian heavy weapons, and Western experts say Russian regular units have bolstered their ranks. The Kremlin denies that, while admitting that Russian "volunteers" are helping the rebels.

The conflict in Donbas erupted after Russia annexed Ukraine's southern Crimea peninsula in March 2014.