A top Iranian negotiator voiced optimism Saturday that talks with the United States seeking to nail down a complex nuclear deal could succeed if Washington showed "good will".
"We remain hopeful and I think that if the other side has the necessary good will and determination, it will be possible to reach a deal," Iran's deputy foreign minister Abbas Araghchi told the Fars news agency.
"The negotiations are continuing in a completely serious atmosphere and both parties want to reach an agreement, but problems, chasms and differences also exist," Araghchi acknowledged.