“There is a real chance for an agreement, but we have many things to do,” Westerwelle told reporters upon arrival at Geneva's Intercontinental Hotel.
Before Westerwelle, Russian Foreign Minister Sergei Lavrov and his French and US counterparts Laurent Fabius and John Kerry also arrived in Geneva.
Also, British Foreign Secretary William Hague and Chinese Foreign Minister Wang Yi are due to arrive in the city today.
The Iranian and G5+1 delegations have gathered in Geneva for the third time and been holding intense negotiations since Wednesday to find a way for the settlement of Tehran’s nuclear standoff with the West.
Iranian Foreign Minister Mohammad Javad Zarif told reporters after four rounds of talks with EU foreign policy chief Catherine Ashton in Geneva on Friday that negotiations have become serious and hopes for striking a deal are still alive.
"The talks have now entered serious stages, and when the negotiations are serious, there are many ups and downs," Zarif told reporters after his fourth bilateral meeting with Ashton on Friday.
