BRUSSELS (AFP) - Major world powers expressed disappointment Friday that Iran has not responded positively to a plan for resolving the standoff over its nuclear programme or agreed to new talks. We are disappointed by the lack of follow-up to understandings reached when the six powers met with Iranian officials in Geneva on October 1, they said in a statement after a meeting in Brussels. Iran has not responded positively to the IAEA (International Atomic Energy Agency) proposed agreement for the provision of nuclear fuel for its Tehran research reactor, they said. Iran has not engaged in an intensified dialogue and in particular has not accepted to have a new meeting, permanent UN Security Council members Britain, China, France, Russia and the United States, plus Germany, added. Many in the West suspect that the Islamic republic is covertly trying to build a nuclear weapon with highly-enriched uranium. Tehran insists it is only developing a civil energy programme, and has rejected attempts to force it to stop uranium enrichment. A senior EU official said the six did not discuss any further specific sanctions against Tehran, but that they planned to forge ahead with a dual-track strategy combining political and economic incentives with the threat of coercive action. They (sanctions) were not discussed in specific terms. There was a general discussion on sanctions. Why not? The answer is that all of these things are a matter of timing, and this was not the right time, he told reporters. The dual track strategy remains the strategy, he said, on condition of anonymity.