This is the 1131st most frequent Japanese word.
ソ連
Soviet Union.
ソ連 refers to the Soviet Union in a general historical context, as the subject of the sentence describing its dissolution.
ソ連は1991年に解体されました。
The Soviet Union was dissolved in 1991.
ソ連 serves as the name of the nation being discussed, specifically in relation to its political stance during a historical period.
冷戦時代、ソ連とアメリカの関係は緊張していました。
During the Cold War, relations between the Soviet Union and the United States were tense.
ソ連 is used to specify the geographical-political place of birth of a person, highlighting the cultural-historical relevance.