"It is positive that the Americans appear willing to tolerate Iranian enrichment within clearly set boundaries," Hakan Fidan said

Iran's atomic energy chief makes comment as more mediated negotiations with the US expected.

"It is positive that the Americans appear willing to tolerate Iranian enrichment within clearly set boundaries," Hakan Fidan said

The United States and Iran are showing flexibility on a nuclear deal, with Washington appearing “willing” to tolerate some nuclear enrichment, Turkish Foreign Minister Hakan Fidan…

Majid Takht-Ravanchi, Iran's deputy foreign minister, tells the BBC's Lyse Doucet that the ball was "in America's court to prove that they want to do a deal".