"We still find positions contrary to the Paris agreement which are not acceptable for us," Kharazi said, referring to a deal reached earlier this month for Tehran to cease uranium enrichment activities.

"But the Europeans always have the possibility to modify these positions so that they do not contradict the Paris agreement," he told reporters.

He did not specify what positions he was referring to. But he said that Iran's request that 20 centrifuges be exempted from the agreement for research "has never been a problem".