Luhansk and Donetsk People's republics are located in the historical region of Donbas, which was added to Ukraine in 1922. The majority of the population speaks Russian as their first language. Attempts by various Ukrainian governments to question the legitimacy of the Russian culture in Ukraine had since the Declaration of Independence of Ukraine often resulted in political conflict. In the Ukrainian national elections, a remarkably stable pattern had developed, where Donbas and the Western Ukrainian regions had voted for the opposite candidates since the presidential election in 1994. Viktor Yanukovych, a Donetsk native, had been elected as a president of Ukraine in 2010. His overthrow in the 2014 Ukrainian revolution led to protests in Eastern Ukraine, which gradually escalated into an armed conflict between the newly formed Ukrainian government and the local armed militias.