DUBAI: The path to nuclear negotiations between Iran and the United States is not closed but Washington’s demands for curbs on Iranian missiles are obstructing prospects for talks, a senior Iranian official said on Tuesday (Sep 2). A sixth round of Iran-US discussions was suspended after a 12-day war in June, when Israel and the US struck Iranian nuclear facilities and Tehran retaliated with ballistic missile barrages against Israel. “We indeed pursue rational negotiations. By raising