US Treasury Secretary Scott Bessent has launched what may be the most aggressive economic pressure campaign against a single country in modern history, announcing a coordinated effort to completely sever Iran from the global financial system.

Bessent described the initiative as the “greatest coordinated economic isolation in the history of the world.”

The ultimatum

In an opinion piece published in the Financial Times, Bessent laid out the administration’s position with the subtlety of a sledgehammer. Countries face a binary choice, he wrote: “You are either with us or against us.”

The target list isn’t limited to Iran itself. The campaign deploys secondary sanctions against any third-party nation or entity that continues providing economic support to Tehran. That language is pointed squarely at China, which has long been one of Iran’s most significant oil trading partners.