Major powers try again on Thursday to negotiate sanctions against Iran for refusing to suspend uranium enrichment but remain divided over how stiff the measures should be, diplomats said.

Iran’s Permanent Representative to the International Atomic Energy Agency (IAEA) Board of Governors Ali Asqar Soltanieh in Vienna on Wednesday called on the UN nuclear watchdog to treat nuclear cases of all world countries through a single approach and under fair and equal conditions.

An Expert Assembly member here in Tehran on Wednesday said that the United States’ pressures on Iran are aimed at stopping Iran’s rapid growth, adding that Washington seeks to prevent the Islamic Republic from becoming a regional power in the Middle-East.