History of Russia
The war ended in 1721 when an exhausted Sweden sued for peace with Russia. Peter acquired four provinces situated south and east of the Gulf of Finland, thus securing his coveted access to the sea. There, in 1703, he had already founded the city that was to become Russia's new capital, Saint Petersburg, as a "window opened upon Europe" to replace Moscow, long Russia's cultural center. Russian intervention in the Commonwealth marked, with the Silent Sejm, the beginning of a 200-year domination of that region by the Russian Empire. In celebration of his conquests, Peter assumed the title of emperor, and the Russian Tsardom officially became the Russian Empire in 1721.
History of Russia (1855–92)
Russia continued to expand its empire, occupying the Caucasus, Tashkent and Samarkand. In foreign affairs, the period began with the conclusion of the Crimean War. Russian policy brought it into conflict with other European powers, in particular Austria-Hungary, as it sought to extend influence over the European portions of the receding Ottoman Empire and regain naval access to the Black Sea. This culminated in a successful war with the Ottoman Empire in 1877–1878, followed by the Treaty of San Stefano and Congress of Berlin in 1878 by which an independent Bulgaria came into being, and by acquisition of former Ottoman territories in the South Caucasus. Russia joined Germany and Austria-Hungary in the League of the Three Emperors, but friction continued with both partners over Bulgaria, and the alliance with Germany came to an end in 1890.