EU foreign policy chief Josep Borrell speaks at the European Council building in Brussels, March 1, 2021 (AP)

On Friday, the European Union's foreign policy chief, Josep Borrell, said he is hopeful that delayed talks with Iran over the nuclear program can produce an agreement.

Talks between Tehran and world powers are deadlocked over Iran's demand for the US to lift the Iran Revolutionary Guard Corps from the US terror list.

Borrell, speaking on the sidelines of a meeting among the G7 in Germany, said that an EU envoy visited Tehran this week for negotiations that went "better than expected."

“The negotiations have been stalled for two months due to this disagreement about what to do with the Revolutionary Guard,” Borrell said.

“These kind of things cannot be solved overnight, but let’s say the negotiations were blocked and they have been deblocked,” he added. “Which means there is a perspective of reaching agreement.”

Today, it was reported that the Vienna talks' top negotiator, Enrique Mora, was detained by German police with no explanation. He was arrested, along with two of his colleagues, where his phone was taken away.

“An EU official on an official mission holding a Spanish diplomatic passport. Took out my passport and my phones,” Mora wrote on Twitter.

“We were kept separated,” he added. “Refusal to give any explanation for what seems a violation of the Vienna Convention.”