But it would be a strong simplification to reduce expansion of Russia only to military conquests. The reunification of Ukraine with Russia took place in 1654, when Polish rule brought the population of Ukraine to revolts (see Pereyaslav Council). Another example is Georgia's accession to Russia in 1783. Given Georgia's history of invasions from the south, an alliance with Russia may have been seen as the only way to discourage or resist Persian and Ottoman aggression, while also establishing a link to Western Europe (see Treaty of Georgievsk). Russia's support helped establish independent Mongolia (independent from China) (see Mongolian Revolution of 1911).