The trilateral discussion was attended by Iranian deputies foreign minister Majid Takht-e-Ravanchi and Abbas Araqchi, US Under Secretaries of State William Burns and Wendy Sherman and Schmid.
The 10th and the latest round of nuclear talks between Iran and the world six powers (US, Britain, France, Russia and China plus Germany) started in Vienna on November 18.
The two sides are tryig to reach an inclusive agreement by November 24.