The five permanent members of the U.N. Security Council plus Germany will meet Wednesday for further discussions on Iran's nuclear program, a Russian deputy foreign minister said Friday.
Interfax news agency quoted Sergei Riabkov as telling journalists the meeting would take place in the German city of Frankfurt at political director level.
Iran is suspected of trying to develop atomic weapons under the guise of a civilian nuclear program, a charge Tehran denies.
Germany's foreign minister declined to confirm the talks, as international pressure is building for further sanctions against Tehran if it refuses to restart negotiations on its nuclear ambitions.
Iran has repeatedly denied it intends to build an atomic bomb and says it has every right to develop a peaceful nuclear program to produce energy.
France, Germany and the U.S. have spoken in favor of an international energy embargo on Iran, which despite being rich in oil lacks domestic refining capacity.
Israeli Prime Minister Benjamin Netanyahu called Thursday during a visit to Berlin for "crippling sanctions" against Iran, saying it posed a mortal threat to Israel's survival.
German Chancellor Angela Merkel said if Iran failed to meet international obligations by next month then "more serious steps" including energy sanctions would have to be considered.
Iran has defied U.N. Security Council sanctions by continuing to enrich uranium, a process which makes fuel for nuclear power plants but can also form the core of an atomic bomb.
The permanent members of the U.N. Security Council - the U.K., China, France, Russia and the U.S. - plus Germany form a six-strong contact group with Iran.