Of, relating to, or involving both China and the Soviet Union.
Chiefly with reference to the period of the Cold War, when the People's Republic of China and the Soviet Union were the major powers within the Communist world.
Sino-Soviet/ˌsʌɪnəʊˈsəʊvɪət/ /ˌsʌɪnəʊˈsɒvɪət/ /ˌsʌɪnəʊˈsəʊvɪɛt/
1920s; earliest use found in Japan Advertiser. From Sino- + Soviet.