When a South Korean cargo ship exploded and caught fire in the Strait of Hormuz late on Monday, Donald Trump wasted no time declaring what he thought it meant. “Perhaps it’s time for South Korea to come and join the mission!” the US president wrote on his social media platform Truth Social, invoking the incident as fresh justification for Seoul to send naval forces to the embattled waterway. Seoul’s answer, for now, has been a polite but firm no – or at least, not yet. The explosion occurred...