Keating alleges that the Soviet Union is building "rocket installations" in Cuba and urges President Kennedy to take action.

On 5 July 1963 the Bulgarian Ministry of Internal Affairs completed an information report on NATO's activity during the Cuban Missile Crisis. In the report, the ministry outlines detailed espionage carried out by NATO agents. According to the report, the NATO Military Intelligence Services provided instructions for NATO member-states' military attaches stationed in Warsaw Pact countries and agents they could get to cooperate with them. Agents were to observe and report specific military intelligence collecting in Warsaw Pact countries -- arms deliveries, missile sites, military movements, etc. The report also includes explanation of how the attaches carried out their intelligence gathering -- reading official press, speaking in Russian and misrepresenting themselves as Russian, etc . The Bulgarian Interior Ministry notes that Western governments were well-informed of Bulgarian military structures -- including exact formations and secret designations.

Boissevain writes after the conclusion of the crisis the Cuban response to the Tripartite Agreement. Fidel Castro proclaimed that no guarantee would be sufficient until all of the following had ceased: the naval and economic blockade, American aid to anti government forces and espionage, piracy from the United States and Puerto Rico, American military flights over Cuba, and dismantling the U.S. naval base in Guantanamo Bay.

The Chinese Embassy in Iraq passes on information from the Cuban Embassy about forces prepared by the CIA for an invasion of Cuba, claiming they included armed anti-Castro exiles of the Cuban Revolutionary Council as well as a separate group of "special agents committed to sabotage and subversion operations."