Nuclear deal with Iran would advance U.S. interests best if it resolved Iran's hostility towards the U.S. but that seems unlikely
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What would happen, then, if Iran actually abandoned that program? The international sanctions regime would be unwound, large amounts of money and human capital would flow into Iran, the regime would be able to stabilize itself internally and would have enormously greater resources with which to pursue its regional goals. A nuclear agreement would advance the regional interests of the US only if it led to a fundamental change in the nature of Iran’s attitudes toward and relationship with the US and its allies.
Such a shift seems most unlikely, however. The entire ideological foundation of the current Iranian regime rests as much on anti-Americanism as it does on anti-Zionism (without much distinction between the two). One could imagine a nuclear deal in which Iran yields almost all of its enrichment capability in exchange for full sanctions relief, but the tone of the agreement would be like the tone of US-Russian relations after the signing of the SALT treaty in 1972. There might well follow a period of détente, but there is no reason to imagine a wholesale change in the fundamental thinking, strategy, and approach of the Islamic Republic. The history of arms treaties amply demonstrates the degree to which the spirit of cooperation in which they are negotiated can be separated from an overall atmosphere of hostility.