These are nervous times in the Gulf region. But they are not without hope. The interim nuclear deal struck by six major world powers and Iran last month could be the first step toward a new-- and less contentious-- regional landscape. But many Arab leaders worry Iran has simply bought itself time and a breather. They accuse Iran of meddling in their countries and stirring sectarian strife, and fear the Islamic Republic’s activities won’t diminish now that some of the pressure long put upon it has eased.