Enter the dignitaries and diplomats. Tensions between Iran, its Middle East neighbors and the U.S. have grown since Iran’s downing of a U.S. drone and recent attacks on tankers near the Strait of Hormuz. A string of critical meetings between heads of state and high-level negotiators over the next several days will determine the direction of oil markets for at least the next six months. At a summit of leaders from Group of 20 nations in Japan later this week, French President Emmanuel Macron and German Chancellor Angela Merkel are expected to speak to President Trump about economic pressure on Iran going forward, report Michael R. Gordon, Ian Talley and Laurence Norman. Mr. Trump has said he’s willing to negotiate with the Islamic Republic, after going against many of his advisers and calling off a military strike in Iran last week. Also at the G-20 gathering, Mr. Trump will […]