US President-elect Joe Biden has not made many foreign policy pledges. Apart from the vague promise to "restore US leadership and credibility" and repair America's alliances from the damage inflicted on them by the Trump administration, neither Mr Biden nor his team of closest advisers has said much about what he proposes to do on foreign and security policies.

Yet there is one topic on which Mr Biden has been very specific: Iran, where he promises to reverse Mr Donald Trump's policy by returning the United States in compliance with the nuclear deal, as part of a broader policy to overhaul the Middle East.