Orthodox Marxism
In the 1960s, the Sino-Soviet split allowed only written communications between the PRC and the USSR, in which each country supported their geopolitical actions with formal statements of Marxist–Leninist ideology as the true road to world communism, which is the general line of the party. In June 1963, the PRC published "The Chinese Communist Party's Proposal Concerning the General Line of the International Communist Movement", to which the USSR replied with the "Open Letter of the Communist Party of the Soviet Union"; each ideological stance perpetuated the Sino-Soviet split. In 1964, Mao said that, in light of the Chinese and Soviet differences about the interpretation and practical application of Orthodox Marxism, a counter-revolution had occurred and re-established capitalism in the USSR; consequently, following Soviet suit, the Warsaw Pact countries broke relations with the PRC.