The Sino-Albanian split refers to the gradual worsening of relations between Albania and the People's Republic of China in the period 1972–78. Both countries had supported each other in the Soviet–Albanian and Sino-Soviet splits, together declaring the necessity of defending Marxism–Leninism against what they regarded as Soviet revisionism within the international communist movement. By the early 1970s, however, Albanian disagreements with certain aspects of Chinese policy deepened as the visit of Nixon to China along with the Chinese announcement of the "Three Worlds Theory" produced strong apprehension in Albania's leadership under Enver Hoxha. Hoxha saw in these events an emerging Chinese alliance with American imperialism and abandonment of proletarian internationalism. In 1978, China broke off its trade relations with Albania, signalling an end to the informal alliance which existed between the two states.
In September 1956, Enver Hoxha headed a delegation of the Central Committee of the Party of Labour of Albania (PLA) at the Eighth Congress of the Communist Party of China. Writing years later of his impressions of the country before the visit, he noted that "we had followed with sympathy the just war of the fraternal Chinese people against the Japanese fascists and aggressors, Chiang Kai-shek reaction and the American interference... We knew also that at the head of the Communist Party of China was Mao Zedong, about whom personally, as well as about the party which he led, we had no information other than what we heard from the Soviet comrades. Both during this period and after 1949 we had not had the opportunity to read any of the works or writings of Mao Zedong, who was said to be a philosopher and to have written a whole series of works. We welcomed the victory of October 1, 1949 with heartfelt joy and we were among the first countries to recognize the new Chinese state and establish fraternal relations with it. Although greater possibilities and ways were now opened for more frequent and closer contacts and links between our two countries, these links remained at the level of friendly, cultural and commercial relations, the sending of some second-rank delegation, mutual support, according to the occasion, through public speeches and statements, the exchange of telegrams on the occasion of celebrations and anniversaries, and almost nothing more."