The document summarizes the history of Crimea from ancient Greek colonies established in the 5th century BC through conquests by various powers like the Greeks, Romans, Huns, Kievan Rus, Byzantium, and Mongols. It then discusses Crimea's annexation by the Russian Empire in 1783 and becoming an autonomous republic within Ukraine in 1991 before being annexed again by Russia in 2014. It provides context around rising tensions between Ukraine and Russia over Crimea in the late 2000s and early 2010s that ultimately led to Russia's annexation of Crimea.