The first formal arms-control agreement was the 1963 Limited Test Ban Treaty, which can be considered mainly an environmental treaty. The second major agreement was the 1968 Nuclear Non-Proliferation Treaty, which aimed at limiting the spread of nuclear weapons.
1963年的部分核禁试条约是首份正式的军控协议，该协议主要可以被视为一份环保条约。1968年的核不扩散条约是第二份主要协议，限制核武器扩散是该协议的主要目的。因为上述两份协议都涉及自然界和第三方，美苏两国将这两份协议均视为正和博弈。