Conflicting diplomatic schedules have caused Japan and China to postpone their next round of talks aimed at resolving a dispute over gas exploration rights in the East China Sea, according to Japanese Foreign Ministry press secretary Mitsuo Sakaba. No new date for talks has been decided upon, he said.Sakaba said the gas dispute talks overlapped the six-party talks on North Korea’s denuclearization that were scheduled to commence Sept. 19.The two nations last met in June in Tokyo for working-level talks, and reports say they have been stepping up efforts to reach an agreement, as they are seeking to compile a plan by the fall to jointly develop the disputed gas fields.One report said...