Ukraine's easternmost oblasts, Donetsk, Luhansk, and Kharkiv, are the site of a theatre of operation in the ongoing Russian invasion of Ukraine.

Donetsk Oblast, also referred to as Donechchyna, is an oblast in eastern Ukraine. It is Ukraine's most populous province, with around 4.1 million residents. Its administrative centre is Donetsk, though due to the ongoing Russo-Ukrainian War, the regional administration was moved to Kramatorsk. Historically, the region has been an important part of the Donbas region. From its creation in 1938 until November 1961, it bore the name Stalino Oblast, in honour of Joseph Stalin. As part of the de-Stalinization process, it was renamed after the Siversky Donets river, the main artery of Eastern Ukraine. Its population is estimated at 4,100,280.