Iran's chief nuclear negotiator has written to the UK, France and Germany to call for the resumption of stalled talks over its atomic programme.
Iran denies it is developing nuclear weapons
The three European powers have led talks with Tehran on behalf of the EU.
Negotiations broke down in August when Iran resumed uranium conversion activities in defiance of international calls to maintain a suspension.
The US accuses Iran of using its nuclear power programme to develop nuclear weapons - a charge it denies.
Tehran's resumption of uranium conversion has led the board of the International Atomic Energy Agency to declare it in breach of its international obligations.
As a result, the Islamic republic faces being reported to the United Nations Security Council, where it could face sanctions.
The letter from Ali Larijani, the secretary of Iran's Supreme National Security Council, was handed to the ambassadors of the UK, France and Germany.
According to Iranian news agencies, Mr Larijani said in the letter that Iran would "welcome negotiations that are constructive and based on logic".
It is the first approach that Mr Larijani has made to the EU powers - known as EU3 - since taking over the nuclear portfolio after hardliner Mahmoud Ahmadinejad became president in June.
The three EU nations have yet to comment.
Mr Ahmadinejad's recent call for Israel to be "wiped off the map" provoked international outrage.