The Partial Test Ban Treaty (PTBT), formally known as the 1963 Treaty Banning Nuclear Weapon Tests in the Atmosphere, in Outer Space and Under Water, prohibited all test detonations of nuclear weapons except for those conducted underground. It is also abbreviated as the Limited Test Ban Treaty (LTBT) and Nuclear Test Ban Treaty (NTBT), though the latter may also refer to the Comprehensive Nuclear-Test-Ban Treaty (CTBT), which succeeded the PTBT for ratifying parties.
Nikita Sergeyevich Khrushchev was First Secretary of the Communist Party of the Soviet Union from 1953 to 1964, and Chairman of the Council of Ministers (premier) from 1958 to 1964. During his rule, Khrushchev stunned the communist world with his denunciation of his predecessor Joseph Stalin's crimes and embarked on a policy of de-Stalinization with his key ally Anastas Mikoyan. He sponsored the early Soviet space program and the enactment of moderate reforms in domestic policy. After some false starts, and a narrowly avoided nuclear war over Cuba, he conducted successful negotiations with the United States to reduce Cold War tensions. In 1964, the Kremlin circle stripped him of power, replacing him with Leonid Brezhnev as First Secretary and Alexei Kosygin as Premier.
In the USSR, during the eleven-year period from the death of Joseph Stalin (1953) to the political ouster of Nikita Khrushchev (1964), the national politics were dominated by the Cold War, including the U.S.–USSR struggle for the global spread of their respective socio-economic systems and ideology, and the defense of hegemonic spheres of influence. Since the mid-1950s, despite the Communist Party of the Soviet Union (CPSU) having disowned Stalinism, the political culture of Stalinism — a very powerful General Secretary of the CPSU—remained in place, albeit weakened.
The Sino-Soviet split was the gradual deterioration of relations between the People's Republic of China (PRC) and the Union of Soviet Socialist Republics (USSR) during the Cold War. This was primarily caused by doctrinal 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, and Moscow feared that Mao was too nonchalant about the horrors of nuclear warfare.
Alexander Nikolayevich Shelepin was a Soviet politician and intelligence officer. A long-time member of the Central Committee of the Communist Party of the Soviet Union, he served as First Deputy Prime Minister, as a full member of the Politburo and as the chairman of the KGB from December 1958 to November 1961. He continued to maintain decisive influence in the KGB until 1967; his successor as chairman of the KGB, Vladimir Semichastny, was his client and protégé.
The Albanian–Chinese split or Sino–Albanian split was the gradual worsening of relations between the People's Socialist Republic of Albania and the People's Republic of China in the period 1972–1978.
After the Russian Revolution, in which the Bolsheviks took over parts of the collapsing Russian Empire in 1918, they faced enormous odds against the German Empire and eventually negotiated terms to pull out of World War I. They then went to war against the White movement, pro-independence movements, rebellious peasants, former supporters, anarchists and foreign interventionists in the bitter civil war. They set up the Soviet Union in 1922 with Vladimir Lenin in charge. At first, it was treated as an unrecognized pariah state because of its repudiating of tsarist debts and threats to destroy capitalism at home and around the world. By 1922, Moscow had repudiated the goal of world revolution, and sought diplomatic recognition and friendly trade relations with the capitalist world, starting with Britain and Germany. Finally, in 1933, the United States gave recognition. Trade and technical help from Germany and the United States arrived in the late 1920s. After Lenin died in 1924, Joseph Stalin, became leader. He transformed the country in the 1930s into an industrial and military power. It strongly opposed Nazi Germany until August 1939, when it suddenly came to friendly terms with Berlin in the Molotov–Ribbentrop Pact. Moscow and Berlin by agreement invaded and partitioned Poland and the Baltic States. Stalin ignored repeated warnings that Hitler planned to invade. He was caught by surprise in June 1941 when Nazi Germany invaded the Soviet Union. The Soviet forces nearly collapsed as the Germans reached the outskirts of Leningrad and Moscow. However, the Soviet Union proved strong enough to defeat Nazi Germany, with help from its key World War II allies, Britain and the United States. The Soviet army occupied most of Eastern Europe and increasingly controlled the governments.
Margaret "Peggy" Seeger is an American folk singer and songwriter. She has lived in Britain for more than 60 years and was married to the singer-songwriter Ewan MacColl until his death in 1989.
Dmitri Trofimovich Shepilov was a Soviet economist, lawyer and politician who served as Minister of Foreign Affairs. He joined the abortive plot to oust Nikita Khrushchev from power in 1957, and was denounced and removed from power. Rehabilitated after Khrushchev's downfall, he lived a largely obscure retirement.
After the establishment of diplomatic ties with the Soviet Union after the Cuban Revolution of 1959, Cuba became increasingly dependent on Soviet markets and military aid and was an ally of the Soviet Union during the Cold War. In 1972 Cuba joined the Council for Mutual Economic Assistance (Comecon), an economic organization of states designed to create co-operation among the communist planned economies, which was dominated by its largest economy, the Soviet Union. Moscow kept in regular contact with Havana and shared varying close relations until the end of the Soviet Union in 1991. Cuba then entered an era of serious economic hardship, the Special Period.
The music of the Soviet Union varied in many genres and epochs. The majority of it was considered to be part of the Russian culture, but other national cultures from the Republics of the Soviet Union made significant contributions as well. The Soviet state supported musical institutions, but also carried out content censorship. According to Vladimir Lenin, "Every artist, everyone who considers himself an artist, has the right to create freely according to his ideal, independently of everything. However, we are communists and we must not stand with folded hands and let chaos develop as it pleases. We must systemically guide this process and form its result."
Polish October, also known as October 1956, Polish thaw, or Gomułka's thaw, marked a change in the politics of Poland in the second half of 1956. Some social scientists term it the Polish October Revolution, which was less dramatic than the Hungarian Revolution of 1956 but may have had an even deeper impact on the Eastern Bloc and on the Soviet Union's relationship to its satellite states in Central and Eastern Europe.
The People's Socialist Republic of Albania, officially the People's Republic of Albania from 1946 until 1976, and from 1991 to 1992 as the Republic of Albania, was the one-party communist state in Albania from 1946 to 1991. It succeeded the Democratic Government of Albania (1944–1946).
Edita Stanislavovna Piekha is a Soviet and Russian singer and actress of Polish descent. She was the third popular female singer, after Klavdiya Shulzhenko and Sofia Rotaru, to be named a People's Artist of the USSR (1988).
The Albanian–Soviet split was the gradual deterioration of relations between the Union of Soviet Socialist Republics (USSR) and the People's Republic of Albania, which occurred in the 1956–1961 period as a result of Soviet leader Nikita Khrushchev's rapprochement with Yugoslavia along with his "Secret Speech" and subsequent de-Stalinization, including efforts to extend these policies into Albania as was occurring in other Eastern Bloc states at the time.
The Khrushchev Thaw is the period from the mid-1950s to the mid-1960s when repression and censorship in the Soviet Union were relaxed due to Nikita Khrushchev's policies of de-Stalinization and peaceful coexistence with other nations. The term was coined after Ilya Ehrenburg's 1954 novel The Thaw ("Оттепель"), sensational for its time.
De-Stalinization comprised a series of political reforms in the Soviet Union after the death of long-time leader Joseph Stalin in 1953, and the thaw brought about by ascension of Nikita Khrushchev to power, and his 1956 secret speech "On the Cult of Personality and Its Consequences", which denounced Stalin's cult of personality and the Stalinist political system.
Shi Zhe was a Chinese Communist military officer, diplomat, translator and interpreter. Trained by the Soviet OGPU, he notably served as the main Russian language interpreter for Mao Zedong on many occasions, most prominently for Mao's meetings with Joseph Stalin during the Chinese leader's visit to the Soviet Union in 1949.
The 9th World Festival of Youth and Students was held from 28 July to 5 August 1968 in Sofia, capital city of the then People's Republic of Bulgaria. The festival attracted 20,000 people from 138 countries. Initially, the event was planned to be held in Algeria in the summer of 1965, but due to the military coup in that country the date was postponed, and Bulgaria became the new venue for the festival.
An International Meeting of Communist and Workers Parties was held in Moscow, Soviet Union, November 16–19, 1957. The meeting was attended by 64 political parties from all over the world. The meeting was the first of its kind, marking a new form of forum for the world communist movement following the disbanding of the Communist International (Comintern) and the Information Bureau of the Communist and Workers' Parties (Cominform). Four additional parties attended clandestinely out of fear of repercussions at home.
Union of Soviet Socialist Republics 
