In 2014, Russia annexed Crimea. Which conflict escalated in eastern Ukraine?

The story behind the answer

The Donbas conflict is correct because, soon after Russia annexed Crimea in March 2014, pro-Russian separatists in the Donetsk and Luhansk regions of eastern Ukraine seized government buildings, sparking a war with Ukrainian forces. Fighting around cities like Sloviansk, Ilovaisk, and later Debaltseve intensified, the MH17 airliner was shot down in July 2014, and the Minsk