Iranian President Hassan Rouhani said Friday talks on Tehran's nuclear program had made no significant progress and urged international powers to show greater flexibility before a November deadline.
"The remaining time for reaching an agreement is extremely short. Progress that has been witnessed in the last few days has been extremely slow," Rouhani told reporters in New York on the sidelines of the UN General Assembly.
Negotiators from the so-called P5+1 group -- Britain, China, France, Russia, the United States plus Germany -- began a new round of talks in New York last Friday, only two months before a November 24 deadline to reach a deal.
Rouhani said "the ball is in the interlocutor's court."
"The progress realized so far has not been significant," he said. "We must strive forward and take more significant steps."
Rouhani said Iran had shown flexibility and now it was up to the other side.
"Serious will does exist, but on this important path we must show courage. Every side must show courage," he said.
The talks moved to a higher level on Thursday when US Secretary of State John Kerry met Iranian Foreign Minister Mohammad Javad Zarif and the EU's chief negotiator Catherine Ashton.
But the trilateral discussion broke up with little news filtering out, and US officials did not respond to AFP inquiries about reports of a new offer on the table.