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The costs and dangers of nuclear build up became more of a concern after 1963 and the chances of successful reductions became greater. The Cuban crisis had brought the USSR and the West to the brink and strengthened anti-nuclear opinion which threatened the western alliance. With the USSR concerned about relations with China and with the US concerned that Containment was involving it in costly and increasingly unpopular involvement in Vietnam there was more of a chance of agreement being reached about arms within the general context of détente. The spiralling costs of arms build-up and the power of the so called military industrial complex worried US leaders. The development of the Nixon Doctrine made US policy makers less concerned with unlimited containment and more open to mutually beneficial arms reductions. With the leaders of the USSR concerned with defence costs and internal living standards falling behind the west, the chances for successful negotiations grew. 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In 1963 there was an agreement to restrict nuclear testing to underground explosions. SALT talks originated in 1969 and the first treaty was signed in 1972. The costs and dangers of nuclear build up became more of a concern after 1963 and the chances of successful reductions became greater. The Cuban crisis had brought the USSR and the West to the brink and strengthened anti-nuclear opinion which threatened the western alliance. With the USSR concerned about relations with China and with the US concerned that Containment was involving it in costly and increasingly unpopular involvement in Vietnam there was more of a chance of agreement being reached about arms within the general context of détente. The spiralling costs of arms build-up and the power of the so called military industrial complex worried US leaders. The development of the Nixon Doctrine made US policy makers less concerned with unlimited containment and more open to mutually beneficial arms reductions. With the leaders of the USSR concerned with defence costs and internal living standards falling behind the west, the chances for successful negotiations grew. There was also more concern in the west as more knowledge of the impact of nuclear explosions grew. Explanations of motives could weigh concerns about dangers after Cuba; pressure of spiralling costs; the impact of public opinion; changes in the direction of US policy and the context of more chance of an agreement with the USSR, given its internal concerns and Russo-Chinese relations. There could be a discussion over whether concerns about the potential destruction of a nuclear war after the Cuban Crisis were more powerful in terms of motives than the internal pressures of mounting costs and the opportunities offered by a greater willingness of the USSR to consider negotiation.

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