Following the collapse of the Ottoman Empire, the British Empire established itself in Azerbaijan, and advocated that all of Karabakh (including Zangezur and Artsakh) should be part of Azerbaijan until the boundaries can be decided upon peacefully at the upcoming Paris Peace Conference of 1919, but the battles did not cease until the Red Army from Russia began reclaiming the former territories of the Russian Empire and created Soviet Azerbaijan out of the Azerbaijan Democratic Republic in 1920. The Armenians of Zangezur and Artsakh had consistently maintained control of the region and intended to unite with Armenia during the entirety of the two years of chaos, with Azerbaijan only temporarily occupying parts of the regions at certain times. The fall of Azerbaijan gave Armenia the opportunity to properly unite with the Armenian irregulars in Zangezur and Artsakh, but they were taken by the Red Army on 26 May 1920. The rest of Armenia fell to the Red Army shortly after.