Abolishing Nuclear Weapons: A Debate
Carnegie Endowment Report, February 2009

In the past few years, horizontal and vertical proliferation have collided. That is, the need for significant strengthening of the nonproliferation regime in the wake of nuclear developments in North Korea, Iran, Iraq, and Pakistan is now absolutely clear. So too, however, is growing unwillingness among non–nuclear-weapon states to even consider additional measures in what they see as the absence of serious progress by the nuclear-armedstates toward disarmament.

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http://www.carnegieendowment.org/publications/index.cfm?fa=view&id=22748&prog=zgp&proj=znpp