ANKARA — Iran has been seeking to shift the format and venue of upcoming negotiations in Turkey with the United States, fueling frustration among regional mediators.

“Iran now is seeking an entirely different meeting from start to finish,” a regional source told Al-Monitor amid mounting uncertainty over whether the long-awaited talks will proceed and on what terms.

The change of heart follows earlier plans for a meeting in Istanbul on Friday that would have brought together US and Iranian officials with key regional powers, including Saudi Arabia,........

© Al Monitor