Iran's deputy foreign minister for legal and international affairs is set to meet representatives of the three European countries in the Sextet of world powers over Tehran's nuclear energy program at the UN headquarters in Vienna, PressTV reported.
The quartet meeting between senior Iranian nuclear negotiator, Seyyed Abbas Araqchi, and the representatives of France, Britain and Germany will take place within the framework of nuclear talks in the Austrian capital on Thursday.
Recently, Araqchi held separate bilateral talks with French representative to the Sextet group of world powers, Nicolas de Rivière, in Paris, and the US representative in nuclear talks, Wendy Sherman, in the Swiss city of Geneva.
Iran and the five permanent members of the UN Security Council plus Germany are expected to resume negotiations over a final deal on the Islamic Republic's nuclear energy program on the sidelines of the United Nations General Assembly session in New York on September 18.
Last November, Iran and the six countries signed an interim deal in Geneva, which took effect on January 20 and expired six months later on July 20.
In July, the two sides agreed to extend negotiations until November 24 after they failed to reach common ground on a number of key issues.