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Letter from Iran: Nuclear miscalculation
The regime’s policy of using nuclear ambiguity as a deterrent may have failed but it has realised it has other cards to play, while its neighbours are reappraising their approach to security
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The diesel crisis
By shutting the Strait of Hormuz, Iran has cut exports of distillate-rich Middle Eastern crude, jet fuel and diesel, and is holding the energy market hostage
Daily life in Tehran during the conflict
Opinion
Politics Iran
Danial Rahmat
Tehran
21 April 2026
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Letter from Iran: Nuclear miscalculation

The regime’s policy of using nuclear ambiguity as a deterrent may have failed but it has realised it has other cards to play, while its neighbours are reappraising their approach to security

Iran appears to have pursued what is commonly described as a ‘nuclear threshold strategy’—developing advanced nuclear capabilities that bring it close to weaponisation without actually building a nuclear bomb. With this approach, Tehran has expanded its enrichment capacity and technical expertise while maintaining that its nuclear programme remains peaceful. The underlying logic has been deterrence through ambiguity: signalling capability and resolve without crossing the final threshold. At first glance, Iran may have believed it was following a model similar to advanced countries that possess latent nuclear capability without weaponisation. However, this comparison overlooks a fundamental s

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