SEOUL, South Korea—South Korean President Moon Jae-in has decided not to visit Japan for the Tokyo Summer Olympics, citing a failure to set up a summit with Japan’s prime minister that would produce meaningful results in improving relations. Moon’s office said Monday that officials from Seoul and Tokyo held talks over longstanding disputes about wartime history and a “future-oriented” development of their relations, but did not find enough common ground to support a summit between their leaders. The countries had been discussing the possibility of Moon visiting Tokyo to participate in the Olympics’ opening ceremony and having talks with Prime Minister Yoshihide Suga about repairing bilateral ties that have sunk to postwar lows in recent years with disputes over history, trade, and military cooperation. It was unclear how close they came to setting up a summit. Seoul said their talks were damaged by a “last-minute obstacle.” The announcement by Moon’s …