Initial efforts to halt the growth of strategic weapons at the multilateral level and to use comprehensive programmes have failed. In January 1964, at the Geneva-based Committee on disarmament of the Eighteen Nations (ENDC), the United States proposed a verified freeze on the number and characteristics of US and Soviet strategic nuclear offensive and defense vehicles for bilateral negotiation. The Soviet Union did not accept this proposal because of the superiority of the United States in the number of weapons at the time. When the United States proposed in 1966 and 1967 that both sides renounce the deployment of defensive weapons (ABM), the Soviet Union proposed to include strategic offensive weapons in the discussion of strategic defense weapons. This proposal was accepted by the United States, and on 1. .