U.S. , Iran hold talks on margins of multilateral meeting on Iran 's nuclear plans . Obama says talks are `` constructive '' start but demands more . Iran participated in the talks along with the EU , Germany and the five permanent members of the U.N. Security Council : the United States , Britain , France , Russia and China . Foreign policy chief confirms another round of talks coming . Comment:
U.S. , Iran hold talks on margins of multilateral meeting on Iran 's nuclear plans . Obama says talks are `` constructive '' start but demands more . Foreign policy chief confirms another round of talks coming . Comment: