The Marxists Internet Archive has made available a 1961 piece by Raya Dunayevskaya on the political tensions inside the Communist world at the time (“The New Russian Communist Manifesto“). Dunayevskaya was an early critic of Mao’s attempt to create a rival center for world Communism and kept a sharp eye on the Russia-China split. Many of the points she makes here are expanded in the chapter she added to the second edition of Marxism and Freedom (“The Challenge of Mao Tse-Tung”) when it was published in 1964. See particularly, the section titled “Can there be a war between Russia and China?: the Non-viability of State-Capitalism”, where she cites this 1961 column. The two Communist giants did go to war briefly in 1969.
Also of interest here is Dunayevskaya’s criticism of Trotskyist (and biographer of Trotsky) Isaac Deutscher whom she says, “has so organic a Communist mentality that he might as well carry a party card.”