US President Donald Trump said there would be no agreement with Iran unless Tehran accepts what he described as "unconditional surrender", outlining a hardline position on the future of the Iranian leadership and the country’s political direction. Grand phrases have a way of sounding decisive in wartime. “Unconditional surrender” is one of them. It carries the echo of 1945, of emperors capitulating and wars ending cleanly on the deck of a battleship. The phrase has resurfaced in Washington’s demands toward Tehran, but political scientist Francis Fukuyama has met it with skepticism. Among other problems, he notes, it assumes a coherent...