The nuclear deal between Iran and the world powers is "an opening for further diplomatic endeavors" to resolve the conflicts in the Middle East, the German foreign minister said in Tehran Saturday.

As this week’s final nuclear talks got underway, there was one uninvited guest: Maryam Imanieh, the wife of Foreign Minister Mohammad Javad Zarif. She arrived at Vienna’s Palais Saxe-Coburg Hotel with Hossein Fereydoon, President Hassan Rouhani’s brother, adding a new twist to the final days of negotiations.

Talks between Secretary of State John Kerry and Iranian Foreign Minister Mohammad Javad Zarif last six hours. A month away from a nuclear deal deadline, U.S. and Iranian diplomats tried to narrow differences over how quickly to ease economic penalties against Tehran and how significantly the Iranians must open up military facilities to international inspections.

Iran has reacted angrily to a European parliament resolution calling on diplomats to shine a spotlight on human rights in their negotiations with Tehran as part of a new strategy towards the country.

Iran and six world powers reached an agreement Sunday on how to implement a short-term deal that was struck in November and gives the parties a six-month time frame, beginning on Jan. 20, in which to conclude a long-term agreement about Iran’s nuclear program. The Islamic Republic will open its nuclear program to daily inspection by international experts, starting the clock on the six-month deadline for a final nuclear agreement.