This memorandum is a compendium of comments about the Treaty of Tlatelolco made by different delegations at the UN. It includes statements by the delegates from the United States, Brazil, Ireland, Ethiopia, Austria, Italy, Pakistan, El Salvador, Mauritania, Iraq, Greece, Spain, Tanzania, Zambia, the Netherlands, Argentina, Venezuela, Sierra Leone, Canada, Jordan, Ecuador, Guyana, Colombia, Malta, Panama, Bolivia, Costa Rica, and Peru, in that order.

Alfonso Garcia Robles explained how the Mexican delegation tried to gather the support of the Latin American countries for the NPT draft. These countries prepared and presented modifications to the NPT text, and the United States and the Soviet Union accepted some of these proposals. Garcia Robles reported that the Argentinian and Brazilian representatives said they recognized the value of the NPT but would not support it if it kept its clause prohibiting peaceful nuclear explosions. The Ambassador also reported the Soviet positive reactions toward the Treaty of Tlatelolco. Garcia Robles recounted the skepticism of some delegations toward the NPT. He recommended not to sign the NPT in 1968 unless the Soviet Union signed Protocol II of the Treaty of Tlatelolco, which includes negative security assurances.

An air letter from Mexican Embassy describing Brazil's role as the mediator of the Cuban crisis, the dismantling of Cuban nuclear weapons bases, and the role of the UN in this conflict.

A message from the Mexican Foreign Ministry to its Embassy stressing that is aware of the Brazilian government’s various proposals to intervene in the resolution of the Cuban-North American problem.

A letter from the Mexican Embassy in Brazil in which he comments on the position taken by the Brazilian Delegate in the Council of the Organization of American States (OAS) to vote in favor of necessary measures to impede the traffic of offensive weapons, but to vote not in favor of a condemnation of the Cuban regime.

Yugoslav President Tito is writing to Brazilian President Goulart discussing concerns over the situation in Cuba. In Tito's opinion, the best course of action is for direct negotiations to continue in the UN.

A Mexican diplomat in New Delhi is requesting more information on Brazil’s offer to mediate Cuba conflict and the possibility of Mexico joining that mediation.

A telegram from the Mexican Foreign Ministry to the Mexican Embassy in Brazil describing a United States resolution was approved. The resolution contains two fundamental points: that Soviet bases in Cuba will be dismantled, and that authorization was given for member states to adopt individual or collective measures including the use of armed force. The resolution was voted for in parts and Mexico, Brazil, and Bolivia abstained from voting on the second part. The impression of the Mexican Foreign Ministry is that the present international situation is of great seriousness.

The Brazilian and Mexican diplomats to Cuba weigh in on their respective governments' opinions on the Cuban crisis and increasing U.S.-Cuban tensions.