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

With an approach to the Soviets already in the works, Kissinger’s top advisers emphasized the importance of a parallel approach to the French, given their centrality to the prospects for a suppliers’ group. While no one could be sure whether the French would abandon their “case-by-case” approach to nuclear exports, the advisers believed that the French disliked nuclear proliferation and wished to remain the only nuclear weapons state in Western Europe.

Helmut Sonnenfeldt informs Kissinger that France has made a direct request to the Pentagon for technical assistance with their ballistic missile program. Attached to the memo is a series of correspondence between Deputy Secretary of Defense Packard and the Director of Defense Research and Engineering, John S. Foster. Foster proposed that he meet with the French Minister of Armaments.

Sonnenfeldt describes for Secretary Kissinger the state of US-French relations after a schism developed in the wake of the 1973 October War, and what impact this would have on the two countries' nuclear cooperation.

Sonnenfeldt summarizes various recent types of military cooperation between the United States and France. These include cooperation on contingency plans for dealing with Germany and US nuclear assistance to France. He suggests that it is time to define the "political philosophy underlying these disparate measures of cooperation."

Sonnenfeldt summarizes the options for providing France with more advanced computers and missile assistance, recommending "a minimal response."

Sonnenfeldt reports on issues with implementing the decisions made in NSDM 103 and 104 to offer military aid to France. Information was leaked to the Joint Committee on Atomic Energy about the offer of more advanced computers and technical assistance with France's ballistic missile program. The Department of State had not yet informed the French and was waiting on various decision to be made. The issues of whether or not to inform the British was also raised.

Memorandum and letters confirming that the French have been informed of the United States' offers of military assistance with their nuclear program.

Sonnenfeldt reports on the status of the US assistance to the French ballistic missile program. The talks are going well, but he notes that the French will likely soon raise the issue of hiring US contractors for direct assistance.

Sonnenfeldt briefs Kissinger on additional points for his meeting with French Minister of Defense Michel Debré in July 1972. There is new information about specific technical requests Debré may make for ballistic missile assistance as well as new information about Debré's views on nuclear strategy and cooperation with US and NATO forces.