United Nations nuclear inspectors are getting a closer look at a once secret Iranian nuclear plant that raised suspicions over the extent and purpose of the program.

President Barack Obama and other Western leaders revealed the site's existence last month.

Critics say the regime has had ample time to remove evidence that the site is being used to produce material for nuclear weapons.

On Friday, Iran missed a deadline to respond to an agreement that would ship its low enriched uranium to Russia for processing.

Foreign Minister Manouchehr Mottaki said Iran may consent to transport only part of its supply of low enriched uranium abroad as requested in the U.N. drafted plan.

"To supply fuel, we may purchase it like in the past, or we may deliver part of (the low enriched uranium) fuel which we currently don't need," Mottaki said.

In either case, Mottaki said Iran has no plans to cease enriching its own uranium.

"Iran's legal peaceful nuclear activities will continue and this issue (Iran's enrichment program) has nothing to do with supplying fuel for the Tehran reactor," he said.

The U.N. brokered plan was intended to allay concerns Iranian labs could enrich uranium to a higher, weapons-grade levels.