Between Us

Between Us

First Read: Iran’s New Nuclear Weapon Attempt

New intelligence suggests Iran explored an ambitious, untested idea: a pure-fusion nuclear weapon

Nadav Eyal's avatar
Nadav Eyal
Dec 19, 2025
∙ Paid

It began quietly, these things usually do, with what Israeli officials described to me as “troubling signs.” At the start of the war, a few months after October 7, 2023, signals came from Iran - fragmentary and easy to dismiss - that did not fit the familiar patterns of uranium enrichment or weaponization. They pointed somewhere stranger. More ambitious…

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