He even said in a speech, “We Cubans understand our international responsibilities. Our people understand their responsibilities because they are aware that we have a common enemy. The enemy that threatens us is the same enemy that threatens everyone. That’s why we declare that the Cuban warriors will support revolutionaries anywhere in the world ”.

Che, who is the second most important person after Castro in Cuba, left Cuba in 1965 for various reasons and first went to Congo and then to Bolivia. Among the reasons for this separation, Che’s failure to be very successful as Minister of Industry, the ideological separation between Castro and Che over time, the dismissal of Castro in the nuclear missile crisis as a betrayal of the Soviets, Castro increasingly There are reasons such as the beginning of his influence, Che’s reputation becoming increasingly ahead of Castro, but none of them are certain. On October 3, 1965, Castro makes a letter from Che Guevara public. In the letter, Che Guevara speaks of his determination to carry the revolution and guerrilla war to other lands, and his commitment to the Cuban revolution and declares that he resigned from his official duties in Cuba. Che, who has not been heard from him for two years, first fought in Congo and then hid in Tanzania, Prague and Cuba, as it would later emerge, and then moved to Bolivia in 1966 as a businessman. Its aim is to initiate an operation with a group of Cubans next to it in the Andes that will liberate all of Latin America. On October 8, Che and his small team, who are hungry, sick and unaware of the outside world, are hugged by Bolivian village guards thanks to an informant. These are teams trained by the USA. The news of the shooting-assassination of Che Guevara by CIA-backed troops in Bolivia on 9 October 1967 shook Castro personally.

The more influential Castro becomes on the World stage, the more his relations with the Soviets begin to decline. In particular, the fact that Cuba refuses to sign the Nuclear Non-Proliferation Treaty by defending its independence and thinks that this agreement is a US-Soviet business agreement aimed at dominating third world countries, he takes the strings thoroughly. Leonid Brezhnev, General Secretary of the Communist Party of the Soviet Union, writes a letter to Castro to control the US-Soviet armament and gives the ultimatum to give the United States the green light to intervene in Cuba if Castro continues his revolutionary and provocative work.

Realizing that he cannot make a worldwide revolution, Castro concentrates again on Cuba. During this period, it began to deviate from the Soviet doctrine of Marxism and gradually approach pure communism. In 1968, influenced by China, it closed all private businesses from cafes to shoemakers in the country and declared business owners as capitalist counter-revolutionaries. As the majority of the population does not see enough incentives to work and produce, productivity drops further with the decline of consumer goods. On top of that, in the society, a revolutionary elite that is superior to them starts to form, living in good houses, using special vehicles, receiving special services in houses and using imported goods.

In 1969 Castro was the 10th anniversary of his government under his control