Nikita Khrushchev in the context of "Vanguard I"

The Cuban Missile Crisis, also known as the October Crisis (Spanish: Crisis de Octubre) in Cuba, or the Caribbean Crisis (Russian: Карибский кризис, romanized: Karibskiy krizis), was a 13-day confrontation between the governments of the United States and the Soviet Union, when American deployments of nuclear missiles in the United Kingdom, Italy and Turkey were matched by Soviet deployments of nuclear missiles in Cuba. The crisis lasted from 16 to 28 October 1962. The confrontation is widely considered the closest the Cold War came to escalating into full-scale nuclear war.

From 1959, the US government based Thor nuclear missiles in England, known as Project Emily. In 1961, the US put Jupiter nuclear missiles in Italy and Turkey. All were within range of Moscow. The US had trained a paramilitary force of Cuban expatriates, which the CIA led in an attempt to invade Cuba and overthrow its government. Starting in November of that year, the US government engaged in a violent campaign of terrorism and sabotage in Cuba, referred to as the Cuban Project, which continued throughout the first half of the 1960s. The Soviet administration was concerned about a Cuban drift towards China, with which the Soviets had an increasingly fractious relationship. In response to these factors the Soviet and Cuban governments agreed, at a meeting between leaders Nikita Khrushchev and Fidel Castro in July 1962, to place nuclear missiles on Cuba to deter a future US invasion. Construction of launch facilities started shortly thereafter.

Volgograd, formerly Tsaritsyn (1589–1925) and Stalingrad (1925–1961), is the largest city and the administrative centre of Volgograd Oblast, Russia. The city lies on the western bank of the Volga, covering an area of 859.4 square kilometres (331.8 square miles), with a population of slightly over one million residents. Volgograd is the 16th-largest city by population size in Russia, the third-largest city of the Southern Federal District, and the fourth-largest city on the Volga.

The city was founded as the fortress of Tsaritsyn in 1589. By the 19th century, Tsaritsyn had become an important river-port and commercial centre, leading to its rapid population growth. In November 1917, at the start of the Russian Civil War, Tsaritsyn came under Bolshevik control. It fell briefly to the White Army in mid-1919 but returned to Bolshevik control in January 1920. In 1925, the city was renamed Stalingrad in honor of Joseph Stalin, who took part in defending the city against the White Army who had then ruled the country. During World War II, Axis forces attacked the city, leading to the Battle of Stalingrad, the largest and bloodiest battle in World War II, from which it received the title of Hero City. The Soviet victory at Stalingrad is widely held to be the turning point of World War II, leading to the destruction of the German army in the East. In 1961, Nikita Khrushchev's administration renamed the city to Volgograd as part of de-Stalinization.

Mikhail Sergeyevich Gorbachev (2 March 1931 – 30 August 2022) was a Soviet and Russian politician who was the last leader of the Soviet Union from 1985 until the country's dissolution in 1991. He served as General Secretary of the Communist Party from 1985, and additionally as head of state from 1988. Ideologically, he initially adhered to Marxism–Leninism, but moved towards social democracy by the early 1990s.

Born in Privolnoye, North Caucasus Krai, into a peasant family of Russian and Ukrainian heritage, Gorbachev grew up under the rule of Joseph Stalin. In his youth, Gorbachev operated combine harvesters on a collective farm, before joining the Communist Party, which then governed the Soviet Union as a one-party state. Studying at Moscow State University, he married fellow student Raisa Titarenko in 1953 and received his law degree in 1955. Moving to Stavropol, he worked for the Komsomol youth organization and, after Stalin's death, became a keen proponent of the de-Stalinization reforms of Soviet leader Nikita Khrushchev.

Joseph Stalin, second leader of the Soviet Union, died on 5 March 1953 at his Kuntsevo Dacha after suffering a stroke, at age 74. He was given a state funeral in Moscow on 9 March, with four days of national mourning declared. On the day of the funeral, of the hundreds of thousands of Soviet citizens visiting the capital to pay their respects, at least 109 were later acknowledged to have died in a crowd crush.

Stalin's body was embalmed and interred in Lenin's Mausoleum until 1961, when it was moved to the Kremlin Wall Necropolis. The members of Stalin's inner circle in charge of organizing his funeral were Nikita Khrushchev, then-head of the Moscow branch of the Communist Party; Lavrentiy Beria, head of the NKVD; Georgy Malenkov, the chairman of the Presidium; and Vyacheslav Molotov, previously the Soviet Union's Minister of Foreign Affairs.

The Premier of the Soviet Union (Russian: Глава Правительства СССР) was the head of government of the Union of Soviet Socialist Republics (USSR). From 1923 to 1946, the name of the office was Chairman of the Council of People's Commissars, and from 1946 to 1991 its name was Chairman of the Council of Ministers. During the dissolution of the Soviet Union in 1991, its name was briefly Prime Minister and later Chairman of the Committee on the Operational Management of the Soviet Economy. The first Soviet premier was the country's founder and first leader, Vladimir Lenin. After General Secretary of the Communist Party Joseph Stalin rose to power in 1924, the de facto leader of the Soviet Union typically was the party's General Secretary, with Stalin and his successor Nikita Khrushchev also serving as premier. Twelve individuals held the post.

Collective leadership (Russian: коллективное руководство, kollektivnoye rukovodstvo), or collectivity of leadership (Russian: коллективность руководства, kollektivnost rukovodstva), became - alongside doctrine such as democratic centralism - official dogma for governance in the Union of Soviet Socialist Republics (USSR) and other socialist states espousing communism.In the Soviet Union itself, the collective leadership concept operated by distributing powers and functions among members of the Politburo and the Central Committee of the Communist Party of the Soviet Union, as well as the Council of Ministers, to hinder any attempts to create a one-man dominance over the Soviet political system by a Soviet leader, such as that seen under Joseph Stalin's rule between the late 1920s and 1953. On the national level, the heart of the collective leadership was officially the Central Committee of the Communist Party. Collective leadership was characterised by limiting the powers of the General Secretary and the Chairman of the Council of Ministers as related to other offices by enhancing the powers of collective bodies, such as the Politburo.

Collective leadership became institutionalised in the upper levels of control in the Soviet Union following Stalin's death in March 1953, and subsequent Soviet Communist Party leaders ruled as part of a collective. First Secretary Nikita Khrushchev criticized Stalin's dictatorial rule at the 20th Party Congress in 1956, but Khrushchev's own increasingly erratic decisions led to his ouster in 1964. The Party replaced Khrushchev in his posts with Leonid Brezhnev as First Secretary and with Alexei Kosygin as Premier. Though Brezhnev gained more and more prominence over his colleagues, he retained the Politburo's support by consulting its members on all policies. Collective leadership continued under Yuri Andropov (General Secretary from 1982 to 1984) and Konstantin Chernenko (General Secretary from 1984 to 1985). Mikhail Gorbachev's reforms espoused open discussion from about 1986, leading to members of the leadership openly disagreeing on how little or how much reform was needed to rejuvenate the Soviet system.

The Political Bureau of the Central Committee of the Communist Party of the Soviet Union, abbreviated as Politburo, was the de facto highest executive authority in the Communist Party of the Soviet Union (CPSU). While elected by and formally accountable to the Central Committee, in practice the Politburo operated as the ruling body of Soviet Russia and the Soviet Union from its creation in 1919 until the party's dissolution in 1991. Full members and candidate (non-voting) members held among the most powerful positions in the Soviet hierarchy, often overlapping with top state roles. Its duties, typically carried out at weekly meetings, included formulating state policy, issuing directives, and ratifying appointments.

The Politburo was originally established as a small group of senior Bolsheviks shortly before the October Revolution of 1917, and was re-established in 1919 to decide on urgent matters during the Russian Civil War. It operated on the principles of democratic centralism, though in practice it increasingly centralized power in the hands of a few. Under Joseph Stalin, the party's General Secretary from 1922 to 1952, the Politburo evolved into an instrument of personal dictatorship. His domination of the body was such that its sessions were often perfunctory, and during the Great Purge from 1936 to 1938, even Politburo members were not immune to persecution. The body was renamed the Presidium between 1952 and 1966. After Stalin's death in 1953, the Politburo's authority became more collective under leaders Nikita Khrushchev and Leonid Brezhnev. During the Brezhnev era from 1964 to 1982, the Politburo grew in size and became increasingly bureaucratic in character. As General Secretary from 1985, Mikhail Gorbachev attempted to reform the Politburo's functions during perestroika, shifting power away from party structures and toward state institutions. The Politburo was officially disbanded upon the banning of the CPSU in late 1991.

The Sino-Soviet split was the gradual worsening of relations between China and the Union of Soviet Socialist Republics (USSR) during the Cold War. This was primarily caused by divergences that arose from their different interpretations and practical applications of Marxism–Leninism, as influenced by their respective geopolitics during the Cold War of 1947–1991. In the late 1950s and early 1960s, Sino-Soviet debates about the interpretation of orthodox Marxism became specific disputes about the Soviet Union's policies of national de-Stalinization and international peaceful coexistence with the Western Bloc, which Chinese leader Mao Zedong decried as revisionism. Against that ideological background, China took a belligerent stance towards the Western world, and publicly rejected the Soviet Union's policy of peaceful coexistence between the Western Bloc and Eastern Bloc. In addition, Beijing resented the Soviet Union's growing ties with India due to factors such as the Sino-Indian border dispute, while Moscow feared that Mao was unconcerned about the drastic consequences of nuclear warfare.

In 1956, Soviet leader Nikita Khrushchev denounced Joseph Stalin and Stalinism in the speech "On the Cult of Personality and Its Consequences" and began the de-Stalinization of the USSR. Mao and the Chinese leadership were appalled as the PRC and the USSR progressively diverged in their interpretations and applications of Leninist theory. By 1961, their intractable ideological differences provoked the PRC's formal denunciation of Soviet communism as the work of "revisionist traitors" in the USSR. The PRC also declared the Soviet Union social imperialist. For Eastern Bloc countries, the Sino-Soviet split was a question of who would lead the revolution for world communism, and to whom (China or the USSR) the vanguard parties of the world would turn for political advice, financial aid, and military assistance. In that vein, both countries competed for the leadership of world communism through the vanguard parties native to the countries in their spheres of influence. The conflict culminated after the Zhenbao Island Incident in 1969, when the Soviet Union reportedly considered the possibility of launching a large-scale nuclear strike against China, and the Chinese leadership, including Mao, was evacuated from Beijing, before both sides eventually returned to diplomatic negotiations.

Wars of national liberation, also called wars of independence or wars of liberation, are conflicts fought by nations to gain independence. The term is used in conjunction with wars against foreign powers (or at least those perceived as foreign) to establish separate sovereign states for the rebelling nationality. From a different point of view, such wars are called insurgencies or rebellions. Guerrilla warfare or asymmetric warfare is often utilized by groups labeled as national liberation movements, often with support from other states. The term "wars of national liberation" is most commonly used for those fought during the decolonization movement. Since these were primarily in the third world, against Western powers and their economic influence, and a major aspect of the Cold War, the phrase has often been applied selectively to criticize the foreign power involved.

Some of these wars were either vocally or materially supported by the Soviet Union, which claimed to be an anti-imperialist power, supporting the replacement of Western-backed governments with local Communist or other non pro-Western parties. In January 1961 Soviet premier Nikita Khrushchev pledged support for "wars of national liberation" throughout the world. On the other hand, the Soviet involvement was often viewed as a way to increase the size and influence of the Soviet Bloc, and thus a form of imperialism itself. The People's Republic of China criticized the Soviet Union as being social imperialist. In turn, China presented themselves as models of independent nationalist development outside of Western influence, particularly as such posturing and other long-term hostility meant they were regarded as a threat to Western power and regarded themselves as such, using their resources to politically, economically and militarily assist movements such as in Vietnam. When the nation is defined in ethnic terms, wars fought to liberate it have often entailed ethnic cleansing or genocide in order to rid the claimed territory of other population groups.

The Tsar Bomba (code name: Ivan or Vanya, internal designation "AN602") was the most powerful nuclear weapon or weapon of any kind ever constructed and tested. A project of the Soviet Union, it was a thermonuclear aerial bomb, tested on 30 October 1961 at the Novaya Zemlya site in the country's far north. The bomb yielded 50 megatons of TNT.

The Soviet physicist Andrei Sakharov oversaw the project at Arzamas-16, while the main work of design was by Sakharov, Viktor Adamsky, Yuri Babayev, Yuri Smirnov [ru], and Yuri Trutnev. The project was ordered by First Secretary of the Communist Party Nikita Khrushchev in July 1961 as part of the Soviet resumption of nuclear testing after the Test Ban Moratorium, with the detonation timed to coincide with the 22nd Congress of the Communist Party of the Soviet Union (CPSU).