Following the disintegration of the Russian Empire, Azerbaijan and Armenia, now both independent, quarrelled over the region of Nakhchivan. When in December 1918 it became clear that the British Chief Commissioner Sir John Oliver Wardrop's peace plan would assign Nakhchivan to Armenia instead of Azerbaijan, Nakhchivanski initiated an Azeri revolt, leading to the proclamation of the independence of the Republic of Aras, composed of the former uyezds of Nakhchivan, Sharur-Daralagez and Surmali, with its capital in the city of Nakhchivan. Nakhchivanski became the head of the new republic, which in essence was de facto controlled by Azerbaijan. In May 1919, in the midst of the Armenian–Azerbaijani War, Armenia advanced its troops into it and managed to capture the city of Nakhchivan by June 1919. There it clashed with regular Azerbaijani troops, which reinstalled Azerbaijan's control over the city within a month. On 10 August 1919, the Armenians were forced to sign a peace treaty.