With a nuclear nonproliferation treaty under consideration in Washington, INR considered which countries were likely to sign on and why or why not. INR analysts, mistakenly as it turned out, believed it unlikely that the Soviet Union would be a co-sponsor of a treaty in part because of the “international climate” and also because Moscow and Washington differed on whether a treaty would recognize a “group capability.”

Concerns about the credibility of US nuclear deterrence generated Supreme Allied Commander Europe (SACEUR) General Lauris Norstad’s proposal for a NATO-controlled medium-range ballistic missile (MRBM) force. This lengthy report represented INR’s assessment of “present and future European interest in national or multinational nuclear weapons capabilities,” including the MRBM proposal, and the extent to which an “enhancement of NATO's nuclear role” could “deter national or multinational European nuclear weapons programs.”

This lengthy report was State Department Bureau of Intelligence and Research's contribution to the first National Intelligence Estimate on the nuclear proliferation, NIE 100-6-57. Written at a time when the United States, the Soviet Union, and the United Kingdom were the only nuclear weapons states, the “Fourth Country” problem referred to the probability that some unspecified country, whether France or China, was likely to be the next nuclear weapons state. Enclosed with letter from Helmut Sonnenfeldt, Division of Research for USSR and Western Europe, to Roger Mateson, 4 June 1957, Secret

This document provides an overview of the London Nuclear Suppliers' Meeting which included the addition of the five newest countries to the original seven. Most old and new members were receptive when Washington lobbied them to support a “long term and stable regime of restraint” on the export of sensitive enrichment and reprocessing technology. While the French were supportive of the moratorium proposal, the Germans were uncomfortable with it, not least because of the implications for their deal with Brazil.

Rush updates National Security Advisor Henry Kissinger on the progress of the Four Powers Negotiations on Berlin, informing him that the "bureaucrats [in the State Department] have been foiled" and an agreement has been completed and "it contains virtually everything we hoped to get under our maximum demands."

US Ambassador Rush recommends to National Security Advisor Henry Kissinger that the negotiations take a "no more than a two week recess" in agreement with the request made by Secretary of State Rogers.

Alarmed by the speed of the negotiations' progress, Secretary Rogers informs Ambassador Rush (and Henry Kissinger) that "an ad referendum agreement should not be reached at the present time."

US Ambassador Rush informs Kissinger on the progress of negotiations between the Soviet Union, France, Great Britain, and the United States on the status of Berlin.

US Ambassador Rush informs Kissinger on the progress of negotiations between the Soviet Union, France, Great Britain, and the United States on the status of Berlin. He reports that negotiations have gone well, aside from difficulties with the British and French ambassadors.

National Security Advisor Henry Kissinger updates President Nixon on the status of the Four Power Berlin negotiations between the Soviet Union, East Germany, West Germany, and the United States, focusing on unresolved issues on which the four states were unable to agree.