The Vladivostok Summit in November 1974 led to a major breakthrough in favour of the agreement, when President Gerald Ford and Secretary General Leonid Brezhnev agreed on the basic framework of the SALT II agreement. The elements of this agreement were declared in force until 1985. Negotiations, known as the Strategic Arms Limitation Talks, began in November 1969 and ended in January 1972 with an agreement on two documents: the Ballistic Missile Treaty (ABM Treaty) and the Interim Agreement on the Limitation of Strategic Offensive Weapons. Both were signed on May 26, 1972. This agreement paved the way for further discussions on international cooperation and the limitation of nuclear weapons, as seen by both the SALT II Treaty and the 1973 Washington Summit. Intensive research has been undertaken to examine the modalities of a possible agreement without the need for access to the territory of the other party. Both the ABM Treaty and the interim agreement stipulate that compliance must be ensured by “national technical verification means”. In addition, the agreements contain provisions that are important measures to enhance the security of offences: both parties agree not to interfere in national technical control. In addition, both countries agree not to take deliberate cover-up measures to impede the review. The agreement allows the contracting parties to withdraw from the agreement with six months` notice if they decide that exceptional events related to the purpose of the agreement have jeopardized their highest interests.
In its unilateral declaration A, the United States stated that if an agreement with more comprehensive restrictions on strategic offensive weapons was not reached within five years, the supreme interests of the United States could be threatened and would provide a basis for the exit of the ABM Treaty. For external and internal reasons, the parties have long been unable to engage in substantive discussions on this issue for external and internal reasons. Finally, on 20 January 1969, the Soviet Union expressed its willingness to discuss strategic restrictions on armaments. On November 17, 1969, the United States and the Soviet Union began the Strategic Arms Conference (SALT I) on the limitation of defense systems from the M and strategic nuclear offensive systems. The first real exploration of potential packages began in the spring of 1970. At one point, the parties got into a deadlock because they were divided on the types of strategic weapons to be included in the treaty. The USSR insisted that basic forward us systems (FBS) were counted in the strategic equation, while the United States believed that FBS and Soviet short-haul, medium- and medium-haul Soviet strategic systems should be dealt with in another forum. The second impasse was caused by differences of opinion on the scope of the future treaty: the Soviet Union proposed to limit negotiations to only discussions on ABM systems, while the United States insisted on the need to make at least one start to limit offensive systems. On 20 May 1971, the impasse was broken when the United States and the USSR announced that they had reached an interim agreement on a partial limitation of certain strategic offensive systems and on a treaty limiting ABM systems. The link between strategic arms restrictions and outstanding issues such as the Middle East, Berlin and especially Vietnam has become the central focus of Nixon and Kissinger`s détente policy. By making connections, they hoped to change the nature and direction of American foreign policy, including the U.S. policy of nuclear disarmament and arms control, and separate it from those practiced by Nixon`s predecessors.