A highly regarded member of Saudi Arabia's royal family recently repeated assertions that Riyadh will want the same capabilities that Iran is allowed under a final agreement on its nuclear program. The Saudi stance, articulated most recently by former intelligence chief Prince Turki al-Faisal, has raised fears that a nuclear agreement between six world powers and Iran will produce a regional domino effect that could spread civilian nuclear programs across the Middle East and increase the number of nuclear weapons states in the region.
Although such a possibility can't be dismissed entirely, a close analysis of probable scenarios suggests that a final Iranian nuclear agreement is unlikely to trigger a regional nuclear weapons cascade....
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Esfandiary, Dina and Ariane Tabatabai. “Why Nuclear Dominoes Won't Fall in the Middle East.” Bulletin of the Atomic Scientists, April 22, 2015