The European Union (EU) has received a letter from Iran asking it to restart the nuclear talks.
"We received the letter today and we're studying it, we're consulting with our E3+3 partners," Xinhua quoted Maja Kocijancic, spokeswoman of EU foreign policy chief Catherine Ashton as saying.
The EU last month decided to impose additional sanctions on Iran, focusing on its central bank and oil exports.
Up to now, some 400 Iranian assets in the continent have been frozen and 113 people subjected to visa ban and asset freeze.
The European Union is an economic and political confederation of 27 member states which are located primarily in Europe.
The E3+3 countries include Britain, US, France, Germany, China and Russia.