The United States and Iran have reached an understanding on the “guiding principles” in nuclear talks, Tehran’s foreign minister said Tuesday, though he cautioned that work still needs to be done to reach an agreement and head off the threat of an American military attack.“I believe we made good progress,” said Abbas Araghchi, the head of the Iranian delegation in Geneva.

​The United States and Iran have reached an understanding on the “guiding principles” in nuclear talks, Tehran’s foreign minister said Tuesday, though he cautioned that work still needs to be done to reach an agreement and head off the threat of an American military attack.“I believe we made good progress,” said Abbas Araghchi, the head of the Iranian delegation in Geneva.