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With an international nuclear weapons ban in place, will a country that has nuclear weapons actually give them up by 2035?

In July 2017, 122 member states of the United Nations adopted a ban on nuclear weapons. The participating states agreed to "never under any circumstances to develop, test, produce, manufacture, otherwise acquire, possess or stockpile nuclear weapons or other nuclear explosive devices."

Notably, none of the nations that currently possess nuclear weapons participated in the negotiations of the ban or adopted the document.

Several treaties prior to this aimed to curb the development of nuclear weapons, notably the 1968 Non-Proliferation Treaty (NPT), which sought to limit nuclear development beyond five nuclear powers - the U.S., Russia, China, the U.K., and France.

Arguments against nuclear disarmament typically cite the principle of deterrence, that the possession of nuclear weapons by some states precludes the development or use of weapons by other states, due to the threat of nuclear retaliation. Proponents of the ban argue that previous efforts have not prevented states such as North Korea from pursuing nuclear programs, and that disarmament, rather than deterrence, is the best way to prevent nuclear war.

It's not unprecedented for states to completely disarm, however. South Africa dismantled its nuclear weapons beginning in 1989 and joined the NPT as a non-nuclear state. Three former Soviet republics, previously part of a nuclear-capable nation, also joined the NPT as non-nuclear states.

Will a state that currently possesses nuclear weapons voluntarily dismantle their stockpile, abandon their nuclear program, and join the UN ban on nuclear weapons by 2035?

This question will resolve if one of the nations currently known to possess operational nuclear weapons (U.S., China, Russia, U.K., France, Israel, India, Pakistan, or North Korea) is certified by the International Atomic Energy Agency to have dismantled all nuclear devices and signs the 2017 UN ban on nuclear weapons on or before Jan 1, 2035.

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