The ‘Fourth Successor’: Iran’s plan for a long war with the US and Israel

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According to a March 2026 report, Iran has developed a military doctrine called "decentralized mosaic defense" designed to withstand attacks from the US or Israel and prolong any potential conflict. This strategy, developed over two decades, prioritizes maintaining operational capacity and decision-making even if Iran loses senior commanders, key facilities, or communication networks. The doctrine, largely associated with the Islamic Revolutionary Guard Corps (IRGC), aims to distribute defensive capabilities across multiple regional layers, including the IRGC, Basij, army units, and local commands. The goal is to prevent a swift resolution to a war by creating a layered defense system capable of long-term attrition, ensuring that the war continues even if central command is compromised.
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AI-ExtractedThe IRGC was led by Mohammad Ali Jafari from 2007 to 2019.
“Mosaic defence” is an Iranian military concept most closely associated with the Islamic Revolutionary Guard Corps (IRGC).
At the centre of that doctrine is what Iranian military thinkers call “decentralised mosaic defence”.
The doctrine has two central aims: to make Iran’s command system difficult to dismantle by force, and to make the battlefield itself harder to resolve quickly.
Iran has spent two decades studying US wars to build a system that could keep fighting even if the capital was bombed.
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