In accordance with the Treaty of Bucharest of 1812, and despite numerous protests by Moldavian nobles on behalf of the sovereignty of their principality, the Ottoman Empire (of which Moldavia was a vassal) ceded to the Russian Empire the eastern half of the territory of the Principality of Moldavia along with Khotyn and old Bessarabia (modern Budjak), which Russia had already conquered and annexed. The new Russian province was called Oblast of Moldavia and Bessarabia, and initially enjoyed a large degree of autonomy. After 1828 this autonomy was progressively restricted and in 1871 the Oblast was transformed into the Bessarabia Governorate, in a process of state-imposed assimilation, Russification. As part of this process, the Tsarist administration in Bessarabia gradually removed the Romanian language from official and religious use.