Aiken’s landmark address to the plenary of the UN General Assembly on 19 September 1958 launched his non-proliferation campaign. It is the first time he publicly identified stopping the spread of nuclear weapons as a concrete step in the collective interest to unblock the disarmament impasse, preventing a runaway arms race among the powers of the Earth. It was clearly framed as part of his wider campaign for global governance based on the rule of law rather than the threat of force. For Aiken, the challenge was stabilizing the arms race and generating trust to construct a world order based on justice and law – “to preserve a Pax Atomica while we build a Pax Mundi.” This speech was a critical departure. The widespread positive reception encouraged Aiken, persuading him to draft a formal resolution.

There was value in Aiken’s advocacy for Ireland to take an independent position in constructing broad-based international support for change. Aiken acted as a potent bridgebuilder between the Western and Eastern camps and also between the Cold War blocs and nonaligned countries. Ireland’s democratic heritage, neutrality and anti-colonial history appealed to many constituencies, not least in Africa and Asia. Even its anti-Communist ideological orientation failed to deter admirers in the Eastern bloc, as they recognized that Aiken was sincere in seeking to propose fresh solutions and reduce international tension. An example of the positive feedback and encouragement that Aiken received is displayed in the attached Irish record of the Polish response.

Aiken made an immediate impression on his arrival in the Twelfth Session of the UN General Assembly in September 1957. He adopted an impartial posture of assessing each issue on its merits and campaigning to remodel international politics around self-determination, humanitarianism, and peace. His exhortation was that only the UN had the moral authority and political legitimacy to put forward global solutions. While he did not propose nuclear disarmament measures specifically, his intent was signaled by his recommendation for a mutual drawback of foreign forces (including their nuclear weapons) in central Europe and his endorsement of a proposal to discuss the representation of China in the United Nations. The Eisenhower administration was hostile to Aiken’s course as outlined in the U.S. ambassador’s audience with Taoiseach Eamon de Valera and Aiken in Dublin on 2 October. The record underlines the Irish concerns about accidental nuclear war due to the proximity of opposing U.S. and Soviet forces in central Europe.  

A record of a conversation in which Brezhnev and Ceausescu discuss weather or not to say that the Nuclear Non-Proliferation Treaty will only be signed once the United States ends its actions in Vietnam. Brezhnev advises not to raise the issue, while Ceausescu claims that it must be stated in order to advance a solution towards disarmament.

Brezhnev starts the conversation by asking if Ceausescu is in agreement about supporting the nuclear non-proliferation treaty.  Ceausescu responds by saying that the draft could still improve by including a guarantee that countries without nuclear weapons will not be attacked by nuclear states and clarifying controls over nuclear weapon production.

Brezhnev and Ceausescu begin by extending warm welcomes to one another before diving into the importance of finalizing a draft of a nuclear nonproliferation treaty. Most of the discussion is spent arguing over the relevance of disarmament within the treaty.

Brezhnev and Ceausescu discuss draft versions of a nuclear nonproliferation treaty, arguing about the language used in the deal. They also discuss the creation of an intergovernmental conference of European countries and agree that they should meet more often in the future.

Nonproliferation talks entered their decisive phase after the submission of a joint U.S.-Soviet draft to the ENDC on February 21, 1967. One week later, High-Commissioner of the French Commissariat à l’énergie atomique, Francis Perrin, assessed France’s options. It was not “by accident,” he noted, the original five UN Security Council permanent members—the United States, the United Kingdom, France, the Soviet Union, and China—were in line for nuclear-club membership: “…they are the same profound reasons, of a geographical, demographic or other nature, which led to the choice [in 1945] … of the countries with special responsibilities in the maintenance of world peace.” After noting how advances in “India, Israel, Japan, Sweden, and also West Germany” portended the further spread of nuclear weapons—and acknowledging France had itself sought help with its weapon program—Perrin pondered whether proliferation might hasten nuclear disarmament by convincing the superpowers of its merits. In the end, however, fear of a “large and hostile” nuclear-armed PRC made him pessimistic. While he did not advise signing the NPT, it would be “very important” for France to affirm publicly, if unilaterally, “its constant policy since 1958 … not to cede any atomic weapon or any atomic explosive device to a country which does not possess it, and not to help any such country to manufacture them.” He dismissed internal opposition toward the NPT as defensive—"an a posteriori justification of the French decision to constitute an atomic armament." More significant was the likelihood West Germany would gain its own atomic arsenal, jeopardizing France’s “dominant political position among the Europe of the Six” members of the European Communities and reviving Cold War tensions in Europe. He finished with an eye-opening analysis of how the Kosygin proposal for nuclear-weapon states to extend negative security guarantees to non-nuclear-weapon states’ signatory to the NPT would not impede the use of French nuclear armaments against a West German blitzkrieg backed by the United States.

The finalization of a completed draft nuclear nonproliferation treaty, which the ENDC transmitted to by the United Nations without endorsement on March 18, 1968, launched a French review of the NPT’s implications for international law. The draft NPT was accompanied by a proposed United Nations Security Council Resolution (UNSC), whose soft guarantees against nuclear-weapon use or threats had been a compromise workd out between Washington and Moscow. An initial study by Foreign Ministry lawyers identified numerous “juridical reasons… to fight against a project that, in its letter if not its spirit, constitutes a revision of the [UN] Charter." The report elaborated on how the hierarchization of “forms of aggression” would “downgrade” non-nuclear (i.e. conventional) violence. Non-nuclear-weapon states treaty signatories would receive non-binding security guarantees. The “Anglo-Saxons and Soviets” would maintain “freedom of action as far as what measures they choose to adopt.” Although the French government’s foremost legal experts opted not to advise vetoing the UNSC resolution, they warned the NPT package could serve as a warrant for nuclear-armed permanent members of the UN Security Council to wage “preventive war” in the name of worldwide nonproliferation.

The French decision to join EURATOM was conditioned on the regional agency not impinging on national nuclear programs. As early as 1955, French Prime Minister Guy Mollet had instructed French negotiators that “Euratom will not be an obstacle toward the possible decision of France … to build nuclear weapons.”  While EURATOM’s jurisdiction would be limited to negotiating purchases of fissile materials, promoting trade with the United States and the United Kingdom, and exchanging reactors designs and civilian technology among members of the Atlantic community, Couve de Murville credited EURATOM with a fringe benefit: monitoring West Germany. In this spring 1960 letter to Prime Minister Michel Debré about revising the treaty, he warned against the removal of EURATOM controls over raw uranium and thorium or enriched uranium. Their removal, he cautioned, would create a dilemma: “either abandon the idea that German’s renunciation of atomic armaments could be enforced or support the enforcement of equivalent controls under the West European Union, which … would interfere in the direction of our programs and the development of our nuclear weapons.”