Iran's nuclear programme is set to top the agenda at talks in Vienna today.
Representatives - will meet with EU and American counterparts to discuss progress of a deal reached last year.
It is expected that the UN atomic watchdog will say that Iran has complied with the agreement aimed at putting a nuclear bomb out of Tehran's reach.
Iran has always denied wanting nuclear weapons saying its activities are exclusively for peaceful purposes like power generation.
The deal will bring an end to 10 years of isolations for Tehran who has been banned from trading with the US.
Foreign companies dealing with Iran will no longer be punished by the US.