Russian Empire different from Tsardom of Russia
Background
The foundations of the Russian Empire was laid during Peter I's reforms, which significantly altered Russia's political and social structure, and as a result of the Great Northern War which strengthened Russia's standing on the world stage. Internal transformations and military victories contributed to the transformation of Russia into a great power, playing a major role in European politics, given the realities of the new situation in the country. On the day of the announcement of the Treaty of Nystad, the 2 November [O.S. 22 October] 1721, the Senate and Synod presented the Tsar with the titles of the Pater Patriae (Russian: Отец отечества, tr. Otets otechestva, IPA: [ɐˈtʲet͡s ɐˈtʲet͡ɕɪstvə]) and the Emperor of all the Russias. It is generally accepted that with the adoption of the imperial title by Peter I, Russia turned from a tsardom into an empire, and the imperial period began.
not same as not identical to distinct from separate from unlike