Iran says it will resume its nuclear fuel research on Monday.
In Tehran Saturday, Iranian officials said inspectors from the International Atomic Energy Agency arrived to remove seals from the country's nuclear facilities. Iran says it will be in close contact with the IAEA regarding the research program.
The announcement came as Russian officials arrived for talks seeking an end to the nuclear impasse with the United States and European Union.
Moscow's proposal, backed by U.S. and EU officials, is aimed at getting Tehran to completely move uranium enrichment off its territory and onto Russian soil to ensure Iran cannot produce nuclear weapons.
Current EU president Austria said the bloc regretted Iran's announcement at a time when international confidence in the peaceful nature of its program is far from restored.
Iran says its nuclear program is for peaceful purposes only. The United States and Europe accuse Iran of clandestine efforts to develop an atomic bomb.
Some information for this report provided by AP, AFP and Reuters.