A meeting between European Union Foreign Policy Chief Javier Solana and Iran's nuclear negotiator, Ali Larijani, has been delayed until after a Group of Eight foreign ministers' meeting in Moscow later this week.
Solana was expected to meet with Larijani this week to discuss the incentives package world powers are ready to offer in exchange for Tehran suspending its uranium enrichment program.
But Solana's office in Brussels said Wednesday the meeting is now expected to take place next week, but declined to specify exact date and venue. No reason was given for the delay.
World powers have been pushing Iran to respond to the incentives offer before the G-8 meeting.
Iran has indicated it will respond by mid-August.
On Tuesday, United Nations Secretary-General Kofi Annan held talks with Iranian Foreign Minister Manouchehr Mottaki, and repeated his suggestion that Iran should speed up its response.
The United States and its European allies accuse Iran of trying to develop nuclear weapons. Tehran denies the allegation.
Some information for this report was provided by AP and Reuters.