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Rip up the Memorandum of Understanding, the ceasefire is well and truly over. Iran and the United States are once more at war - with oil tankers targeted and the Strait of Hormuz firmly shut.
Donald Trump's response? He insists the US will take control of the disputed waterway and act as a "guardian angel" for all ships passing through.
Originally, he wanted to charge a 20% toll for the privilege, before backtracking on what seemed like an unworkable claim.
But is the US still in danger of being dragged deeper into a long-term conflict with Iran that could have repercussions for the region - and the global economy - for years to come?
Niall Paterson is joined by Sky's military analyst Professor Michael Clarke.
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