This famous, de-classified document officially started the Soviet atomic project aimed at producing the nuclear bomb. The second point of this document orders the Ukrainian Academy of Sciences to establish a plan for the project of Uranium enrichment. F. Lange, a scientist from the Ukraine Institute of Physics and Technology, was appointed as head of this project because he worked previously on theoretical aspects of Uranium enrichment.

This speech by East German Minister of State Security Mielke is about technological, intellectual, and ideological preparations for war by the west and how to uncover and organize indicators of a potential attack.

This report by Ministry of State Security describes developments and achievements toward early recognition of a surprise nuclear missile attack on the USSR (Complex RYAN).

This document is a plan for the consultations to take place in Berlin between the Stasi and the KBG. It includes objectives and proposed theses on the subject of early recognition of a sudden nuclear missile attack by the adversary.

This letter by KGB Chairman Chebrikov responds to an earlier letter sent by East German Minister for State Security Mielke. In it, Chebrikov agrees to the proposed meeting between the MfS and the KGB on the subject of a sudden nuclear missile attack on the states of the socialist community.

This letter, from East German Minister of State Security Mielke to KGB Chairman Chebrikov, requests a consultation on the development and continuation of Complex RYAN, especially on furthering collaboration between the MfS and KGB.

This report describes conversations with Comrade Kryuchkov, coving a multitude of subjects, but delving briefly into the problem of "prevention of a surprise nuclear attack" (RYAN). Kryuchkov responded that this issue is being continually worked on, but no central decisions had been made as of yet.

This brief note written by the Ministry of State Security includes a number of questions for the leadership of the KGB in the USSR, such as whether other elements, like military doctrine or emergency responses, should be examined as possible options for starting a war.

Memorandum summarizing consultations between the Stasi and KGB over RYAN (Raketno-Yadernoe Napadenie, or “nuclear weapon attack”), an intelligence program initiated by the KGB to collect indicators of a potential nuclear first-strike by the US. The KGB had developed a new system for the early detection of war preparations for a first-strike attack, which should provide evidence of such preparations on the basis of “objective” indicators that would be hard to manipulate.

Soviet Foreign Minister Andrei Gromyko cables the Soviet Embassy in Havana that the Soviet leadership had decided to allow UNSG U Thant and his representatives to visit Soviet launchers sites in Cuba and verify that the launchers are being dismantled.