Talks meant to nudge Iran toward heeding UN Security Council demands to stop uranium enrichment collapsed today, with Tehran shrugging off calls by six world powers to cease the activity that could be harnessed to make nuclear arms.

Six world powers sidestepped Iran’s refusal to discuss scrapping uranium enrichment today, offering instead to revive smaller-scale talks in hopes they will lead to broader dialogue about Tehran’s nuclear activities.

Iran said differences were narrowing at talks today with six world powers looking for curbs on Tehran’s developing nuclear weapons.