`` We have identified all of the issues we need to address '' for final deal , says Mehr . The next round of talks will begin on Tuesday , U.S. State Department foreign policy chief says . That agreement came into effect in January . EU spokeswoman says talks have been `` constructive and useful '' Western powers suspect The United States wants to develop a nuclear weapon , a claim it denies .
`` We have identified all of the issues we need to address '' for final deal , says Mehr . The next round of talks will begin on Tuesday , U.S. State Department foreign policy chief says . EU spokeswoman says talks have been `` constructive and useful '' Western powers suspect The United States wants to develop a nuclear weapon , a claim it denies .