It's been a year since dozens of countries got together to enforce a landmark ban on nuclear weapons, yet the goal of eradication seems as distant as ever. For the states that refused to sign the treaty—countries with nuclear arms and others under their protection—discussions to prevent further spread of nuclear arms are not progressing. That stalemate has prompted some to ask: If the world's most powerful countries can't even agree to slim their nuclear arsenal, what hope is there of abolishing the weapons altogether?

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