Meanwhile, China's Foreign Minister Wang Yi is meeting with his German counterpart Frank-Walter Steinmeier.
Iran and P5+1 countries, comprising Russia, China, the United States, the United Kingdom, France and Germany, are in Switzerland to work out a mutually acceptable solution on Tehran's nuclear program by the March 31 deadline.
The negotiating parties have been making attempts to reach an agreement on the peaceful nature of Iran's nuclear program for a long time, with the West accusing Tehran of developing nuclear weapons.
Iranian authorities have dismissed the allegations, saying that the country's nuclear activities were aimed at meeting Iran's growing energy needs.
The negotiators are expected to work out a comprehensive agreement guaranteeing the peaceful nature of the program by July.