France, Germany and the United Kingdom have moved to reimpose United Nations sanctions on Iran over its nuclear program.

Britain, France and Germany say Iran has failed to abide by a 2015 deal with world powers that aimed to prevent it from developing a nuclear weapon.

Iran is threatening to ban inspections if it is hit by new sanctions under a nearly expiring nuclear deal from 2015—a day after allowing inspectors limited access to its Bushehr facility. Newsweek has contacted the International Atomic Energy Agency (IAEA) for comment.

DUBAI (Reuters) -UN nuclear inspectors have returned to Iran for the first time since it suspended cooperation with them in the wake of Israel's attacks on its nuclear sites, Iranian state media reported on Wednesday.

Britain, France and Germany launched a 30-day process to reimpose U.N. sanctions on Iran over its nuclear programme on Thursday, according to a letter sent by the three nations to the U.N. Security Council seen by Reuters.

Inspectors have returned only to the Bushehr nuclear power plant, not to other sensitive sites, including those hit by U.S. bombs.

There is no final agreement between the IAEA and Iran yet, says Iranian foreign minister, but talks will continue.