Signed in 1972, it was in force for the next 30 years. Following the dissolution of the Soviet Union, in 1997 the United States and four former Soviet republics agreed to succeed to the treaty. In June 2002 the United States withdrew from the treaty, leading to its termination.
Download the Treaty here.
New START replaced the Treaty of Moscow (SORT), which was due to expire in December 2012. In terms of name, it is a follow-up to the START I treaty, which expired in December 2009, the proposed START II treaty, which never entered into force, and the START III treaty, for which negotiations were never concluded.
Under terms of the treaty, the number of strategic nuclear missile launchers will be reduced by half. A new inspection and verification regime will be established, replacing the SORT mechanism. It does not limit the number of operationally inactive stockpiled nuclear warheads that remain in the high thousands in both the Russian and American inventories.
Negotiations for a framework deal over the nuclear program of Iran took place between the foreign ministers of the countries at a series of meetings held from 26 March to 2 April 2015 in Lausanne, Switzerland. On 2 April the talks came to a conclusion and a press conference was held by Federica Mogherini (High Representative of the European Union for Foreign Affairs) and Mohammad Javad Zarif (Minister of Foreign Affairs of Iran) to announce that the eight nations had reached an agreement on a framework deal. The parties announced that "Today, we have taken a decisive step: we have reached solutions on key parameters of a Joint Comprehensive Plan of Action." with a goal of working out this final deal by 30 June 2015. Announcing the framework, Foreign Minister Zarif stated: "No agreement has been reached so we do not have any obligation yet. Nobody has obligations now other than obligations that we already undertook under the Joint Plan of Action that we adopted in Geneva in November 2013."