Explanation:

The North Atlantic Treaty Organization, also called the North Atlantic Alliance, is an intergovernmental military alliance between 30 North American and European countries. The organization implements the North Atlantic Treaty that was signed on 4 April 1949.
The Comprehensive Nuclear-Test–Ban Treaty is a multilateral treaty that bans all nuclear explosions, for both civilian and military purposes, in all environments
The NPT is a landmark international treaty whose objective is to prevent the spread of nuclear weapons and weapons technology, to promote cooperation in the peaceful uses of nuclear energy and to further the goal of achieving nuclear disarmament and general and complete disarmament.
The Strategic Arms Limitation Talks were two rounds of bilateral conferences and corresponding international treaties involving the United States and the Soviet Union, the Cold War superpowers, on the issue of arms control. The two rounds of talks and agreements were SALT I and SALT II.