US intelligence agencies have recently assessed that Iran can effectively shut down access to the Strait of Hormuz at will from now on, meaning the country’s regime has acquired a powerful new ability to hurt the global economy as a result of the war, according to three sources familiar with the findings.

Regardless of the framework agreement that is due to be formally signed on Friday to open the key waterway as a prelude to nuclear talks, Iran proved it can shut off access to the strait during the current conflict and US intelligence assessments suggest that could happen again.

“We have now handed Iran de facto control over the strait – a weapon more powerful than any nuke,” one of the sources familiar with the US intelligence assessments told CNN, emphasizing how the war has fundamentally altered Tehran’s thinking about leveraging similar tactics in the future.

Iran has similarly learned it can leverage targeted strikes against the energy infrastructure of Gulf countries as an asymmetric capability after doing so to great effect during the war, another tool it can use to its advantage going forward, a second source familiar with the assessments said.

The US has had to negotiate with Iran intensively to fully re-open the strait, underscoring the Iranians’ continued leverage.