Before Donald Trump delivered his prime-time address to the American people on April 1, many commentators predicted he would claim victory and signal that the US air campaign against Iran would be wound down – even without a deal with Tehran to open the Strait of Hormuz. As it turned out, Trump said he would double down on the violence, promising to hit Iran “extremely hard” in coming weeks.

The White House simultaneously released a document headlined: President Trump’s Clear and Unchanging Objectives Drive Decisive Success Against Iranian Regime. “From day one,” it stated, “the objectives have been clear: obliterate Iran’s missiles and production, annihilate its navy, sever its support for terrorist proxies, and ensure it never acquires a nuclear weapon.” These objectives, Trump said, were nearly complete and he expected to finish the job “very fast”.

For the US president, the key marker of the success or otherwise of this foreign policy gambit will come in November’s midterm elections. So his strategic decisions are likely to be heavily influenced by the need to be able to claim victory, while also limiting any negative outcomes from the energy price shock engulfing the world. To do this, he must declare victory fairly soon.

But Trump’s partner in the war, Israel’s prime minister Benjamin Netanyahu, has a markedly different set of strategic priorities (although electoral politics will also play a big part in........

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