In his 1873 book On War, the great Prussian military strategist Carl von Clausewitz wrote that: “War is the realm of uncertainty.” He would have been at home in Washington this week where Clausewitz’s “fog of war” appears to have descended on the White House, at times obscuring reality.

On Tuesday, the US secretary of state, Marco Rubio, briefed reporters that the US plan was to get the Strait of Hormuz “back to the way it was: anyone can use it, no mines in the water, nobody paying tolls”.

This was, of course, the way things were before the war actually started.

But uncertainty about what this war was actually all about has been a hallmark of the past two months. When the conflict began on the last day of February, the US said it was about preventing Iran from developing a nuclear weapon. Although the US president, Donald Trump, added a layer of complexity by saying it was also about regime change.

Trump’s closest ally, the Israeli prime minister, added another later by insisting this was also about getting rid of Iran’s ballistic missiles and launchers and neutralising its proxies in the region.

Christian Emery, an expert in international relations at University College London – who specialises in US-Iranian affairs – sees this lack of coherence about what the war is for as underscoring “that this entire enterprise has been a colossal strategic failure”.

As things stand it now appears possible that an interim deal could well open the Strait of Hormuz to allow the global economy to return to something like normal. But the main reasons the US and Israel launched the war are unlikely to be resolved any time soon and the episode has proved to Tehran – and the rest of the world – that Iran can use its geography to........

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