This is a collection of primary source documents focusing on the difficult road to the establishment of the alliance between the People's Republic of China and the Soviet Union. For other collections on Sino-Soviet relations, see Sino-Soviet Alliance, 1950-1959; Sino-Soviet Split, 1960-1984; Sino-Soviet Border Conflict, 1969; and Sino-Soviet Rapprochement, 1985-1989. For a collections resource guide see The Sino-Soviet Alliance, 70 Years Later.(Image: Mao at Stalin's side on a ceremony arranged for Stalin's 71th birthday in Moscow in December 1949.)