28 May 2026

The Nuclear Brink Revisited: Assessing Coercive Diplomacy in Iran

E-International Relations | Martina Sprague

Iran's nuclear program significantly accelerated in the months leading up to the 12-Day War in June 2025, with its uranium stockpile reaching 408.6 kilograms of 60 percent purity by May 17, 2025, despite ongoing diplomatic efforts. This surge, coupled with expanded operations and advanced centrifuges at Natanz and Fordow, drastically reduced breakout time, culminating in U.S. and Israeli strikes on Iranian nuclear sites.

The article argues that continuous coercive pressure has failed to generate lasting strategic restraint in Iran due to a persistent credibility deficit regarding the target regime’s survival. Classical coercive diplomacy frameworks are insufficient when authoritarian regimes perceive compliance as a path to destruction. Drawing on comparative cases like Iraq, North Korea, and Libya, the analysis proposes a "fifth pillar": the target state must be convinced that compliance will not lead to the overthrow of its ruling elite. The U.S. withdrawal from the 2015 JCPOA and Ukraine's experience reinforce Iran's belief that a nuclear deterrent, not international law, guarantees sovereignty. Iran's pivot towards a Russia-China-Iran axis and the asymmetry between reversible and irreversible actions further diminish Western coercive effectiveness.

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