TEHRAN, Nov. 1 -- Iran's top security official said Washington had changed its tone toward Tehran, but that he had not yet replied to a letter from US Vice President JD Vance, acknowledging an American approach without announcing an agreement to resume negotiations.

Mohsen Rezaei, secretary of Iran's Supreme National Security Council, welcomed the change in remarks broadcast on Iranian television on Saturday. Iran's foreign minister separately said no meeting with American officials was planned, even as intermediaries continued their work.

The distinction matters ahead of the November 3 US midterm elections, which have become a reference point in concerns about another round of American strikes. A letter has reached Tehran and Iranian o...