Major world powers have expressed disappointment that Iran has not responded positively to a plan for resolving the standoff over its nuclear programme or agreed to new talks. A joint statement issued in Brussels, Belgium said Iran has not responded positively to the IAEA proposed agreement for the provision of nuclear fuel for its Tehranresearch reactor. Permanent UN Security Council members Britain, China, France, Russia and the United States, plus Germany, added that Teheran has not engaged in an intensified dialogue and in particular has not accepted to have a new meeting. 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.<br/>