America’s inability to rein in Tehran’s nuclear program after exiting the 2015 nuclear deal — to halt the Islamic Republic’s subsequent accumulation of fissile material and to forge a “longer and stronger” deal — should prompt Washington to reassess its Iran policy. Such a reckoning should acknowledge that the United States has never used all of the implements in its policy toolkit to rein in Iran’s nuclear ambitions, while the tools it has generally relied on — diplomacy, sanctions, and (to a much lesser extent) the threat of force — are less effective today due to a shifting geopolitical landscape.
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