Japanese Prime Minister Shinzo Abe called on Iranian President Hassan Rouhani on Wednesday to avoid a further escalation of tensions and an unintended military conflict in the Middle East, as he sought to nudge Tehran toward dialogue as a mediator with the United States.Speaking after talks with Rouhani at the Saadabad Palace in Tehran, Abe offered to do whatever Japan can to reduce friction between Iran and the United States. But he added Iran also needs to play a "constructive role" in bringing peace and stability in the region.