In a secret supplement to information from the VIII Congress of the People's Socialist Party, Bulgarian delegates Abramov and Tellalov summarize answers that Blas Roca, the Cuban delegation head, provided the congress. Roca claimed that socialism is the end goal of the revolution, but it is not publicly discussed. He explained the Communist party's involvement in the revolution and July 26th Movement. Abramov and Tellalov also describe the reestablishment of relations and disagreements between Cuba and Yugoslavia, including discussions about weapons. Fidel Castro met with socialist country representatives and described Cuba's plans to nationalize enterprises, particularly American. During the congress Castro described the evolution of the July 26th Movement and the consolidation of Communism in Cuba. Abramov and Tellalov endorse Castro's leadership and review the Cuban military's strengths and weaknesses. There is a brief mention Sino-Soviet relations.

A conversation between China’s Ambassador to Cuba Shen Jian and Cuban Finance Minister Ernesto “Che” Guevara. They discuss the situation of the Cuban economy given recent U.S. blockades, as well as the various situations in other countries like Yugoslavia, Argentina and Guatemala.

Conversation for the record between Zhivkov and Castro during a four-day-long state visit of the Cuban leader to Bulgaria. Among the main issues discussed was the state of economic development in both countries, their relations with Albania, China, Romania and Yugoslavia; the Cuban foreign policy in Africa and the Caribbean; the civil war in Angola; the battle for the Third World.