According to the Treaty on the Nonproliferation of Nuclear Weapons (NPT),

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The Treaty on the Nonproliferation of Nuclear Weapons (NPT) requires signatory nuclear states to refrain from transferring nuclear weapons technology to non-nuclear states. This is aimed at preventing the spread of nuclear weapons to new states and reducing the risk of nuclear war. The treaty does not require disarmament, periodic inspections by U.S. inspectors, or a ban on building new weapons, although it does call for negotiations on disarmament. The treaty also does not explicitly prohibit the use of nuclear weapons, but it does require nuclear powers to respect the sovereignty of non-nuclear states and refrain from using nuclear weapons against them.