Russia, officially the Russian Federation, is a country in Eastern Europe and North Asia. It is the largest country in the world, spanning eleven time zones and sharing land borders with fourteen countries. With a population of over 140 million, Russia is the most populous country in Europe and the ninth-most populous in the world. It is a highly urbanised country, with sixteen of its urban areas having more than 1 million inhabitants. Moscow, the most populous metropolitan area in Europe, is the capital and largest city of Russia, while Saint Petersburg is its second-largest city and a major cultural centre.

Human settlement on modern Russian territory dates back to the Lower Paleolithic. The emergence of the East Slavs as a prominent group in Europe between the 3rd and 8th centuries AD led to the establishment of Kievan Rus' in the 9th century, which adopted Orthodox Christianity from the Byzantine Empire in 988. Following its disintegration, the late medieval Grand Principality of Moscow led the unification of Russian lands, culminating in the formation of the Tsardom of Russia in 1547. By the early 18th century, Russia had expanded vastly through conquest, annexation, and the efforts of Russian explorers. It was proclaimed as the Russian Empire in 1721, which became the third-largest empire in history. The Russian Revolution of 1917 led to the abolition of the Russian monarchy and the creation of the Russian SFSR, the first socialist state. Following the Russian Civil War, Russia became the largest and principal constituent of the newly established Soviet Union in 1922. Amidst rapid industrialisation in the 1930s, millions died under Joseph Stalin. The Soviet Union played a decisive role for the Allies in World War II by leading large-scale efforts on the Eastern Front. During the Cold War, it emerged as a superpower and competed with the United States for ideological dominance. The Soviet era saw some of the most significant Russian technological achievements, including the first human-made satellite and the first human expedition into outer space.

In 1991, the Russian SFSR emerged from the dissolution of the Soviet Union as the Russian Federation. Following a constitutional crisis in 1993, a new constitution was adopted, establishing a semi-presidential republic. Since the turn of the century, Russia's political system has been dominated by Vladimir Putin, under whose leadership it has experienced democratic backsliding, transforming into an authoritarian regime. Russia has been militarily involved in numerous conflicts, including its war with Georgia in 2008 and its war with Ukraine since 2014, which in the latter has involved the internationally unrecognised annexation of Crimea in 2014 and four additional regions following the 2022 Russian invasion of Ukraine, resulting in a full-scale war.

Russia is generally considered a great power and wields significant regional influence in Europe, possessing the largest stockpile of nuclear weapons and having the third-highest military expenditure in the world. Its economy ranks among the largest in the world, relying on its vast mineral and energy resources, mainly oil and natural gas. Russia continues to rank very low in measurements of democracy, human rights and media freedom, while having high levels of corruption. As the successor state of the Soviet Union, it retains its seat as a permanent member of the United Nations Security Council and is a member state of several international organisations. Russia is also home to 32 UNESCO World Heritage Sites.