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.
Russian Empire
Peter's first military efforts were directed against the Ottoman Turks. His attention then turned to the North. Peter still lacked a secure northern seaport, except at Archangel on the White Sea, where the harbor was frozen for nine months a year. Access to the Baltic was blocked by Sweden, whose territory enclosed it on three sides. Peter's ambitions for a "window to the sea" led him to make a secret alliance in 1699 with Saxony, the Polish–Lithuanian Commonwealth and Denmark against Sweden, resulting in the Great Northern War. The war ended in 1721 when an exhausted Sweden asked for peace with Russia. Peter acquired four provinces situated south and east of the Gulf of Finland. The coveted access to the sea was now secured. There he built Russia's new capital, Saint Petersburg, to replace Moscow, which had long been Russia's cultural center. In 1722, he turned his aspirations as first Russian monarch toward increasing Russian influence in the Caucasus and the Caspian Sea at the expense of the weakened Safavid Persians. He made Astrakhan the centre of military efforts against Persia, and waged the first full-scale war against them in 1722–23.