Under its terms, the eastern part of the Principality of Moldavia, between Prut and Dniester Rivers, with an area of (later known as Bessarabia), was ceded by the Ottoman Empire (to which Moldavia was a vassal) to Russia. Also, Russia obtained trading rights on the Danube. A truce was signed with the rebelling Serbs and autonomy given to Serbia. The treaty, signed by the Russian commander Mikhail Kutuzov, was ratified by Alexander I of Russia just one day before Napoleon's invasion of Russia.[citation needed]