Japan–Soviet Union; Japanese–Soviet
Historical term used in contexts such as diplomacy, trade, and war, referring to relations between Japan and the Soviet Union (now Russia). Commonly seen in compounds like 日ソ共同宣言 (Japan–Soviet Joint Declaration).
The Japan–Soviet Joint Declaration was signed in 1956.
Japan–Soviet fishery negotiations were held.
Standard abbreviation for Japan–Soviet Union relations. The ソ is katakana 'so' from ソ連 (Soviet Union).
Ateji spelling using 蘇 for 'So'; rarely seen in modern texts.
Abbreviation of 日本 (Japan) and ソ連 (Soviet Union), using the first character of each. The reading にっソ comes from 日 (にち) + ソ, with gemination.