paragraph_text: The Soviet Union Olympic football team was the national football team of the Soviet Union from 1959 to 1990. The team participated in most of the qualification football tournaments for Summer Olympics. Until 1992, when age restrictions were officially introduced, the Soviet Union fielded its reserves in qualification tournaments, while in the finals the first team participated. Starting from 1990 the Soviet Union national under-21 football team participated in the Olympic qualifying competitions.

paragraph_text: Under the 1977 Constitution of the Union of Soviet Socialist Republics (USSR), the Chairman of the Council of Ministers was the head of government and the Chairman of the Presidium of the Supreme Soviet was the head of state. The office of the Chairman of the Council of Ministers was comparable to a prime minister in the First World, whereas the office of the Chairman of the Presidium was comparable to a president in the First World. In the Soviet Union's seventy - year history there was no official leader of the Soviet Union office, but during most of that era there was a de facto top leader who usually led the country through the office of the Premier or the office of the General Secretary of the Communist Party of the Soviet Union (CPSU). In the ideology of Vladimir Lenin the head of the Soviet state was a collegiate body of the vanguard party (see What Is to Be Done?).

paragraph_text: Following the Welles Declaration of July 23, 1940, the annexation of Latvia into the Soviet Union (USSR) on 5 August 1940 was not recognized as legitimate by the United States, the European Community, and recognition of it as the nominal fifteenth constituent republic of the USSR was withheld for five decades. Its territory was subsequently conquered by Nazi Germany in June -- July 1941, before being retaken by the Soviets in 1944 -- 1945. Nevertheless, Latvia continued to exist as a de jure independent country with a number of countries continued to recognize Latvian diplomats and consuls who still functioned in the name of their former governments.

paragraph_text: Nikita Sergeyevich Khrushchev (15 April (O.S. 3 April) 1894 -- 11 September 1971) was a Soviet politician who led the Soviet Union during part of the Cold War as the First Secretary of the Communist Party of the Soviet Union from 1953 to 1964, and as Chairman of the Council of Ministers, or Premier, from 1958 to 1964. Khrushchev was responsible for the de-Stalinization of the Soviet Union, for backing the progress of the early Soviet space program, and for several relatively liberal reforms in areas of domestic policy. Khrushchev's party colleagues removed him from power in 1964, replacing him with Leonid Brezhnev as First Secretary and Alexei Kosygin as Premier.

paragraph_text: In 1957 the Soviet Union launched the world's first artificial satellite, Sputnik 1. Since then, about 6,600 satellites from more than 40 countries have been launched. According to a 2013 estimate, 3,600 remained in orbit. Of those, about 1,000 were operational; while the rest have lived out their useful lives and become space debris. Approximately 500 operational satellites are in low - Earth orbit, 50 are in medium - Earth orbit (at 20,000 km), and the rest are in geostationary orbit (at 36,000 km). A few large satellites have been launched in parts and assembled in orbit. Over a dozen space probes have been placed into orbit around other bodies and become artificial satellites to the Moon, Mercury, Venus, Mars, Jupiter, Saturn, a few asteroids, a comet and the Sun.

paragraph_text: The Congress of People's Deputies of the Soviet Union () was the highest body of state authority of the Soviet Union from 1989 to 1991.

paragraph_text: Stalinism is the means of governing and related policies implemented from around 1927 to 1953 by Joseph Stalin (1878–1953). Stalinist policies and ideas as developed in the Soviet Union included rapid industrialization, the theory of socialism in one country, a totalitarian state, collectivization of agriculture, a cult of personality and subordination of the interests of foreign communist parties to those of the Communist Party of the Soviet Union, deemed by Stalinism to be the leading vanguard party of communist revolution at the time.

paragraph_text: With an area of 2,700,000 square kilometres (1,000,000 sq mi) – equivalent in size to Western Europe – Kazakhstan is the ninth-largest country and largest landlocked country in the world. While it was part of the Soviet Union, Kazakhstan lost some of its territory to China's Xinjiang autonomous region and some to Uzbekistan's Karakalpakstan autonomous republic.

paragraph_text: Armenia was annexed by Bolshevist Russia and along with Georgia and Azerbaijan, it was incorporated into the Soviet Union as part of the Transcaucasian SFSR (TSFSR) on 4 March 1922. With this annexation, the Treaty of Alexandropol was superseded by the Turkish-Soviet Treaty of Kars. In the agreement, Turkey allowed the Soviet Union to assume control over Adjara with the port city of Batumi in return for sovereignty over the cities of Kars, Ardahan, and Iğdır, all of which were part of Russian Armenia.

paragraph_text: Pojuschie Gitary ( , "The Singing Guitars") were the Soviet Union's first rock band to reach a phenomenal rate of success and popularity in the Soviet Union, Eastern Europe and in other countries. For that reason, they are often nicknamed "the Soviet Beatles" in a manner not that different from Hungary's Illés and Poland's Czerwone Gitary, whose name means "Red Guitars".

paragraph_text: Pechora Radar Station () is an early warning radar near Pechora in the Komi Republic, northern Russia. It is a key part of the Russian early warning system against missile attack and was built by the Soviet Union, becoming operational in 1984. It is run by the Russian Aerospace Defence Forces.

paragraph_text: On 27 October 1981, a Whiskey-class submarine (U 137) from the Soviet Union ran aground close to the naval base at Karlskrona in the southern part of the country. Research has never clearly established whether the submarine ended up on the shoals through a navigational mistake or if an enemy committed espionage against Swedish military potential. The incident triggered a diplomatic crisis between Sweden and the Soviet Union. Following the 1986 assassination of Olof Palme and with the end of the Cold War, Sweden has adopted a more traditional foreign policy approach. Nevertheless, the country remains active in peace keeping missions and maintains a considerable foreign aid budget.

paragraph_text: ER1 electric trainset was manufactured by Rīgas Vagonbūves Rūpnīca between 1957 and 1962 for suburban commuting usage within the Soviet Union on lines electrified on 3000 V, DC.

paragraph_text: The PTBT was signed by the governments of the Soviet Union, United Kingdom, and United States in Moscow on 5 August 1963 before being opened for signature by other countries. The treaty formally went into effect on 10 October 1963. Since then, 123 other states have become party to the treaty. Ten states have signed but not ratified the treaty.

paragraph_text: As African states became independent in the 1960s, the Soviet Union offered many of their citizens the chance to study in Russia. Over a period of 40 years, about 400,000 African students from various countries moved to Russia to pursue higher studies, including many Black Africans. This extended beyond the Soviet Union to many countries of the Eastern bloc.

paragraph_text: The Soviet Union entered a series of Five - Year Plans which began in 1928 under the rule of Joseph Stalin. Stalin launched what would be referred as a ``revolution from above ''to improve the Soviet Union's domestic policy, more importantly centered around rapid industrialization and secondly, the collectivization of agriculture. His desire was to rid the country of all record that capitalism once existed there under the New Economic Policy.

paragraph_text: Rīgas Balss () was a tabloid newspaper published in Riga, Latvia, published in Latvian and Russian languages. The Russian edition has turned into "Vechernyaya Riga" in 2001 and ceased publication in 2004. Latvian edition has turned into journal in 2008 and ceased publication in 2009.

paragraph_text: The most extreme case was the Soviet Union, and this model may still be followed in some countries: it was a separate service, on a par with the navy or ground force. In the Soviet Union this was called Voyska PVO, and had both fighter aircraft and ground-based systems. This was divided into two arms, PVO Strany, the Strategic Air defence Service responsible for Air Defence of the Homeland, created in 1941 and becoming an independent service in 1954, and PVO SV, Air Defence of the Ground Forces. Subsequently these became part of the air force and ground forces respectively

paragraph_text: Militarization was another aspect of the Soviet state. Large parts of the country, especially the coastal areas, were closed to all but the Soviet military. Most of the sea shore and all sea islands (including Saaremaa and Hiiumaa) were declared "border zones". People not actually residing there were restricted from travelling to them without a permit. A notable closed military installation was the city of Paldiski, which was entirely closed to all public access. The city had a support base for the Soviet Baltic Fleet's submarines and several large military bases, including a nuclear submarine training centre complete with a full-scale model of a nuclear submarine with working nuclear reactors. The Paldiski reactors building passed into Estonian control in 1994 after the last Russian troops left the country. Immigration was another effect of Soviet occupation. Hundreds of thousands of migrants were relocated to Estonia from other parts of the Soviet Union to assist industrialisation and militarisation, contributing an increase of about half a million people within 45 years.

paragraph_text: After World War II, eastern European countries such as the Soviet Union, Poland, Czechoslovakia, Hungary, Romania and Yugoslavia expelled the Germans from their territories. Many of those had inhabited these lands for centuries, developing a unique culture. Germans were also forced to leave the former eastern territories of Germany, which were annexed by Poland (Silesia, Pomerania, parts of Brandenburg and southern part of East Prussia) and the Soviet Union (northern part of East Prussia). Between 12 and 16,5 million ethnic Germans and German citizens were expelled westwards to allied-occupied Germany.

Question: When did the country Rīgas Balss is from become part of the Soviet Union?
Answer: 5 August 1940