Wikimedia Commons image of the Soviet Union and client states, c. 1979. From: http://upload.wikimedia.org/wikipedia/commons/thumb/5/54/Sino-Soviet_split_1980.svg/940px-Sino-Soviet_split_1980.svg.png
Excerpt of Politburo memo "On the Situation in A," original available online at: http://www2.gwu.edu/~nsarchiv/NSAEBB/NSAEBB396/docs/1979-12-12%20Concerning%20the%20Situation%20in%20A.pdf