The Abkhaz–Georgian conflict involves ethnic conflict between Georgians and the Abkhaz people in Abkhazia, a de facto independent, partially recognized republic. In a broader sense, one can view the Georgian–Abkhaz conflict as part of a geopolitical conflict in the Caucasus region, intensified at the end of the 20th century with the dissolution of the Soviet Union in 1991. The conflict, one of the bloodiest in the post-Soviet era, remains unresolved. The Georgian government has offered substantial autonomy to Abkhazia several times. However, both the Abkhaz government and the opposition in Abkhazia refuse any form of union with Georgia. Abkhaz regard their independence as the result of a war of liberation from Georgia, while Georgians believe that historically Abkhazia has always formed part of Georgia. Georgians formed the single largest ethnic group in pre-war Abkhazia, with a 45.7% plurality as of 1989. During the war the Abkhaz separatist side carried out an ethnic cleansing campaign which resulted in the expulsion of up to 250,000 and in the killing of more than 5,000 ethnic Georgians. The Organization for Security and Co-operation in Europe (OSCE) conventions of Lisbon, Budapest and Istanbul have officially recognized the ethnic cleansing of Georgians, which UN General Assembly Resolution GA/10708 also mentions. The UN Security Council has passed a series of resolutions in which it appeals for a cease-fire. Soviet era Both Abkhazia and other Georgian principalities were annexed into the Russian Empire in the nineteenth century, and remained part of it until the Russian Revolutions of 1917. While Georgia initially joined the Transcaucasian Democratic Federative Republic and subsequently became independent as the Democratic Republic of Georgia (DRG) in 1918, Abkhazia was initially controlled by a group of Bolsheviks, before ultimately joining the DRG, though its status was never clarified. In 1921 the Red Army invaded Abkhazia and Georgia, eventually incorporating them into the Transcaucasian Socialist Federative Soviet Republic. Initially Abkhazia was formed as an independent Soviet republic, the Socialist Soviet Republic of Abkhazia (SSR Abkhazia), though it was united with the Georgian Soviet Socialist Republic by a treaty; in 1931 the SSR Abkhazia was downgraded to an autonomous republic within the Georgian SSR, to much opposition from the Abkhaz. Throughout the Soviet era the Abkhazians called for their quasi-independent status to be restored. Demonstrations in support of this occurred in 1931 immediately after the dissolution of the SSR Abkhazia, and again in 1957, 1967, 1978, and 1989.