Photo by Central Press/Getty Images.

Photo by Central Press/Getty Images.

  • The Non-Proliferation Treaty (NPT) was negotiated with the expectation that future progress on nuclear disarmament would be necessary to ensure the treaty's sustainability.

  • The security benefits of the NPT meant that states were not willing to make the non-proliferation obligation conditional on the achievement of specific disarmament measures, which explains the vague language of Article VI. This calculation likely remains true today.

  • Anxiety about disarmament during the NPT's negotiation was fundamentally a matter of politics, and was not confined to non-aligned states. This also appears to be true today.

  • The NPT review process was partly designed to encourage states to debate progress on nuclear disarmament, but review conferences lack the ability to resolve those debates.

  • Some states that pressed hard for disarmament concessions in the NPT negotiations also harboured nuclear weapons aspirations; today, disarmament advocacy can sometimes provide political cover for those seeking to undermine non-proliferation. However, the perceived injustice of the NPT bargain is acute, and ‘calling the bluff’ of non-nuclear weapons states dissatisfied with progress on disarmament risks generating political momentum that can also damage the treaty.