Shirabe
蘇維埃

蘇維埃ソビエト

Common Noun
Español jmdict
1
noun (common) (futsuumeishi) Unión Soviética (eng: Soviet Union)
English jmdict
1
noun (common) (futsuumeishi) word usually written using kana alone historical term soviet
from rus «sovet»
2
noun (common) (futsuumeishi) word usually written using kana alone historical term abbreviation Soviet Union
See also: ソビエト連邦 (ソビエトれんぽう)
私はソビエト連邦のことはまったく知らない。
I don't know about the USSR at all.