Which city did Russia establish as a port on the Baltic Sea after their victory in 1721?

The establishment of St. Petersburg as a port on the Baltic Sea was a significant outcome of Russia's victory in the Great Northern War, which concluded in 1721 with the Treaty of Nystad. Peter the Great, the Tsar of Russia at the time, sought to position Russia as a major European power and to gain access to warm-water ports.

St. Petersburg was strategically located along the Neva River and directly connected to the Baltic Sea, facilitating trade and naval access. Founded in 1703, St. Petersburg was designed to represent the aspirations of a modern, westernized Russia and served as the capital until 1918. This city was built on land that had been contested during the war and symbolized Russia's territorial expansion and dominance in the region.

The other cities mentioned do not fit this context: Moscow, while the historical capital for centuries, is inland and not a Baltic port; Novgorod is an ancient city with a rich history but it was not established as a port by Russia after the 1721 victory; and Kiev, located in modern Ukraine, is significant for its own historical context but does not relate to this particular event and the establishment of a Baltic port. Thus, St. Petersburg stands out