The convergence of Chinese and Soviet interests in the Yemens began in the 1960s. This paper describes the buildup of influence of those states as background for a discussion of their actions and reactions during the internationally significant events of 1978 and 1979.
Creekman, Charles T. Jr.
"Sino-Soviet Competition in the Yemens,"
Naval War College Review: Vol. 32
, Article 9.
Available at: http://digital-commons.usnwc.edu/nwc-review/vol32/iss5/9