The Bulgarian Embassy in Havana reports to the Central Committee of the Bulgarian Communist Party and the Bulgarian Ministry of Foreign Affairs on political, economic, and cultural developments in Cuba circa 1963. Cuba is politically united, but is experiencing economic hardship after the “Caribbean Crisis” primarily because of the US embargo. In the report, embassy staff reviews developments between socialist countries and Cuba throughout 1963. Some examples include communist aid to Cuba after Hurricane Flora and Cuba’s stance on Sino-Soviet relations. Bulgaria’s show of solidarity resulted in concrete political, economic, and cultural cooperation. Embassy staff notes the drawbacks and benefits of Bulgaria’s relationship with Cuba.

Bulgaria's General Consul in Istanbul, Turkey, reported to the Ministry of Foreign Affairs information he received from the Chief of the Greek General Staff to Turkey. As recorded, the Greek General Staff reported a meeting between Turkish and Greek governments. The governments discussed a non-aggression pact between Warsaw Pact and NATO countries and the use of Polaris missile submarines in Turkish waters.

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.

Deputy Forieng Minister Lubomir Angelov transmits to Bulgaria's embassy in Turkey information from Bulgarian Ambassador to Great Britain Radenko Grigorov. Angelov's message is handwritten and reports news about Soviet and US submarine presence in the Mediterranean, which initially Grigorov acquired from Turkey's ambassador to Great Britain.

Bulgarian Embassy in Athens staff member Atanasov reports on Greek media accounts of military preparations to the Bulgarian Ministry of Foreign Affairs. According to Atanasov, Greek newspapers report preparations include Soviet movements in the Mediterranean in response to US submarines carrying Polaris missiles, Bulgarian maneuvers near the Greek and Turkish borders, and an anticipated NATO forward strategy in Greece. Atanasov adds that NATO is preparing the defense of possible attacks on Greece.

Bulgarian Ambassador to Greece Nikolai Minchev relays recent newspaper reports to the Bulgarian Ministry of Foreign Affairs. Minchev summarizes a recent NATO meeting in Athens where NATO staff and Turkish and Greek military personal discussed security in the two nations and the Balkan region as a whole.

Bulgarian Charge d’Affaires in the US Kiril Shterev reports to the Bulgarian Ministry of Foreign Affairs that US Deputy Secretary of Defense Roswell Gilpatric stated that three submarines carrying Polaris missiles will be deployed to the Mediterranean Sea. The deployment follows US withdrawal from Italian and Turkish bases after the Cuban Missile Crisis.

Bulgaria's Charge d' Affaires to the US Kiril Shterev writes to the Bulgarian Ministry of Foreign Affairs explaining that the US planned on stationing B47 bombers in Turkey once the Jupiter missiles are removed from Turkey. Shterev cites journalist Paul Scott as his source for the information about the display of the Unites States' military presence.

Bulgarian General Consul in Istanbul Dimo Karadimov reports to the Bulgarian Foreign Ministry news of new ballistic missiles in Turkey. Specifically, Karadimov notes that the US military will replace Jupiter missiles with Polaris missiles within the year. Karadimov cannot confirm NATO's involvement.

In his cable to the Bulgarian Foreign Ministry, Ambasador Kiril Shterev reports information about expected US assistance to Greece in 1963. Shterev acquired the information during lunch with the Greek Charge d' Affaires, Counselor Kalougeras. Kalougeras also mentioned Turkey's possible entrance into the European Economic Community and inquired about US-Bulgarian relations.