The régime and perhaps the very concept of non-proliferation is being undermined by the Moscow Treaty and NPT depositary States themselves. What would be the reaction in Latin America or in the rest of the world if the depositary government of the Treaty of Tlatelolco were the first to stop properly complying with its provisions? A couple of months ago, on 14 February, the Director-General of the International Atomic Energy Agency, Dr. Hans Blix, stated in an address to the Graduate Institute of International Studies in Geneva: "I should in fairness point out that while 'horizontal proliferation' is a risk, 'vertical proliferation' is a reality". And he added: "The nuclear-weapon States, especially the super-Powers, are very active to prevent further proliferation. There is perhaps something paradoxical about nuclear-weapon States desperately urging non-nuclear-weapon States not to do what they themselves seem to find indispensible to continue doing, namely, develop nuclear weapons". Over the past few years, some statements have been heard and some events have occurred which are frankly discouraging. In September 1987, the United States and the Soviet Union agreed to conduct the "nuclear testing talks". The aim of those talks is not to prohibit all nuclear tests, but rather to trace out an extended programme of "step-by-step" negotiations on nuclear tests and their verification. The position of the United States Administration announced in 1988 and repeated on several occasions. CD/PV.554 36 (Mr, Marin Bosch. Mexico ') including 18 October of last year, during the forty-fourth session of the General Assembly, by the Director of the Arms Control and Disarmament Agency, is to regard the complete prohibition of all nuclear tests as a long-term goal, since his country's security and that of its allies depends, and will continue to depend, on the deterrent capacity of its nuclear arsenal. 
**Analysis**
The text appears to be discussing international politics and diplomacy, specifically the topic of nuclear proliferation and disarmament. The language used is formal and technical, suggesting a focus on international relations, treaties, and government policies. The text also references specific organizations, such as the International Atomic Energy Agency, and quotes high-ranking officials, further supporting the conclusion that this text belongs to a category related to international relations and politics.

**Category**
International relations, Science and technology