Russia, officially known as both Russia and the Russian Federation. It is a federal semi-presidential republic, comprising 83 federal subjects. From northwest to southeast, Russia shares borders with Norway, Finland, Estonia, Latvia, Lithuania and Poland (both via Kaliningrad Oblast), Belarus, Ukraine, Georgia, Azerbaijan, Kazakhstan, the People's Republic of China, Mongolia, and North Korea. It also has maritime borders with Japan by the Sea of Okhotsk, and the United States by the Bering Strait. At 17,075,400 square kilometres (6,592,800 sq mi), Russia is the largest country in the world, covering more than a ninth of the Earth's land area. Russia is also the ninth most populous nation with 143 million people. It extends across the whole of northern Asia and 40% of Europe, spanning 9 time zones and incorporating a wide range of environments and landforms. Russia has the world's largest reserves of mineral and energy resources. It has the world's largest forest reserves and its lakes contain approximately one-quarter of the world's fresh water.

The nation's history began with that of the East Slavs, who emerged as a recognizable group in Europe between the 3rd and 8th centuries AD. Founded and ruled by a Varangian warrior elite and their descendants, the predecessor of modern Russia, Kievan Rus', arose in the 9th century and adopted Orthodox Christianity from the Byzantine Empire in 988, beginning the synthesis of Byzantine and Slavic cultures that defined Russian culture for the next millennium. Kievan Rus' ultimately disintegrated into a number of smaller states; most of the Rus' lands ultimately were overrun by the Mongol invasion and became tributaries of the nomadic Golden Horde.  The Grand Duchy of Moscow gradually reunified the surrounding Russian principalities, achieved independence from the Golden Horde, and came to dominate the cultural and political legacy of Kievan Rus'. By the 18th century, the nation had greatly expanded through conquest, annexation, and exploration to become the Russian Empire, which was the third largest empire in history, stretching from Poland in Europe to Alaska in North America.

Russia established worldwide power and influence from the times of the Russian Empire to being the largest and leading constituent of the Soviet Union, the world's first constitutionally socialist state and a recognized superpower,that played a decisive role in the Allied victory in World War II. The Soviet era saw some of the greatest technology achievements of the 20th century, such as the world's first human spaceflight. The Russian Federation was founded following the dissolution of the Soviet Union in 1991, but is recognized as the continuing legal personality of the Soviet state. Russia has the world's 10th largest economy by nominal GDP or the 6th largest by purchasing power parity, with the 5th largest nominal military budget. It is one of the five recognized nuclear weapons states and possesses the largest stockpile of weapons of mass destruction. Russia is a great power and a permanent member of the United Nations Security Council, a member of the G8, G20, the Council of Europe, the Asia-Pacific Economic Cooperation, the Shanghai Cooperation Organisation, the Eurasian Economic Community, the Organisation for Security and Cooperation in Europe (OSCE), and is the leading member of the Commonwealth of Independent States.