Calling it a "very shocking" incident, South Korea's new president on Tuesday demanded an investigation into why his office wasn't told by defense officials about the arrival of several additional launchers for a contentious U.S. missile defense system meant to cope with North Korea's nuclear threat. Before taking office on May 10, Moon Jae-in vowed to review the deployment of a system that has infuriated both North Korea and China, which consider its powerful radar a security threat. Many of Moon's supporters don't want the system, which U.S. President Donald Trump suggested Seoul should pay for. On Tuesday, senior presidential...