The ambassador describes the domestic situation in Cuba and what it is like in Havana specifically in detail. He recounts a meeting with Foreign Minister Raul Roa.

In a conversation between Kliszko and Raul Castro, a referral was made to the position assumed by the Minister of Industry in Cuba, Ernesto Guevara, at the economic seminar of Afro-Asian countries in Algeria in February 1965. Castro stated that he was not prepared to discuss the essence of the issue, e.g. the extent of aid from socialist countries to developing countries, but he felt Guevara's comments were extreme and out-of-place at the seminar.

The conversation between Castro and Gomulka took place on the initiative of Castro. Parties discussed the following topics: (1) relations between the UPSR and the PUWP, (2) the issue of the legalization of the Cuban Revolution, (3) the Situation in Vietnam, (4) Cuba and the Current Situation in Latin America, (5) the position of the PUWP with regard to the conference of 81 parties, and (6) the attitude of the socialist camp towards Cuba.

During a trip from Orneta to Katowice, Raul Castro and Zenon Kliszko had conversation on the following topics: (1) assessment of the position of the Italian Communist Party, (2)assessment of the position of the Romanian Workers’ Party, (3) the UPSR and other Communist Parties in Asia, and (4) the Matter of a Former Member of the National Leadership UPSR – J. Ordoqui. For the Polish side, the program of the Italian Communist Party is not clear, particularly with regard to the question of establishing a uniform workers’ party.

During his visit in Poland, Castro relates Cuba's position on a conversation taken place in Moscow and why it may be of interest to the Cubans. Gomulka raises the issue of the missiles. In Gomulka's opinion two factors were decisive: contradictions which arose within the socialist camp and the policy which was conducted by Khrushchev. Gomulka is assured that US is capable of conducting a war with Cuba by way of conventional weapons, it does not have to use nuclear weapons. It is clear that the socialist camp and the USSR cannot defend Cuba in any other way but by using nuclear weapons. If a conflict is meant to be, then it will be a nuclear conflict, there is no other way. Gomulka further raises a question whether to go into a nuclear war or not. Castro disagrees with a manner nuclear weapons were withdrawn from Cuba by Soviets. Khruchshev explained that he did not have time. Per Gomulka, Khrushchev conducted a policy which was not thought-out and which was all-out. Gomulka further discusses his talks with Chinese and Vietnamese comrades re: nuclear weapons issue.

Van Roijen continues on the conversation he had with U.S. Secretary of State Dean Rusk from the last cable. Rusk believes Cuba may be aligning more with China and is factoring in Chinese interests in Cuba. However, Rusk also saw Chinese initiatives in North Korea and North Vietnam. The relationship with China is, in his words, "not a long-term worry like Moscow but a short-term worry."

Boissevain reports on the ongoing cold war between the United States and Cuba and its effect on Cuban society. Cuba's national airport is maintaining service to Mexico city but is marked by continued delays and cancellations. Trade is limited only to Cuban and Spanish ships flying under the flag of the Soviet Union and its satellites. Kennedy's latest address heralds more hardship for the Cuban people. The letter concludes with the prospect of Japan buying Cuban sugar based on a meeting with Japanese Ambassador to Cuba Rokuzo Yaguchi.

Boissevain writes to the Dutch Minister of Foreign Affairs on the status of the Soviet missiles in Cuba. There are reports of hidden missiles within Cuba, buried in underground fortifications by the Soviets. He attaches confidential information that details the locations and means of concealment of these missiles.

Boissevain reports to Amsterdam the current domestic situation in Cuba, with attention being paid to Havana. In his words, Cuba is "on a war footing," and describes the various posters with propagandistic slogans urging the people to stand strong against a possible American invasion.

The letter begins with Boissevain criticizing Castro's speech, claiming he could have written it before it was ever delivered. The speech concerned Castro's meeting with UN Secretary General U Thant, and the contents of the speech were such that the Cuban people were kept at boiling point. Boissevain claims this is a necessity to make the people accept the sacrifices demanded of them and forget the hardships they face. Castro's exclamations that "we are above all Marxist-Leninists" raised applause, but Soviet support has died down. Boissevain suspects Anastas Mikoyan will have a hard time reasoning with Castro after the disappointment in the eyes of Cuba.