Iran plans to restrict UN inspections if the US does not lift sanctions by February 21; Thursday meeting 'unlikely' to prevent Tehran from moving ahead

IAEA head to visit Tehran, ahead of Iranian intention to end snap inspections

Iranian foreign ministry says it'll prevent certain visits by UN watchdog if other parties to nuclear accord 'fail to meet their obligations'

Key date comes on February 21 when Tehran, under new law passed by conservative parliament, is set to stop allowing intrusive inspections by IAEA, unless US sanctions eased

Material can be used as component in nuclear weapons; European foreign ministers have warned move has 'grave military implications'

Diplomats tell Wall Street Journal UN agency seeking explanations for radioactive materials found in locations Tehran blocked access to last year

International Atomic Energy Agency says Islamic Republic enriching more uranium at underground site, will install more equipment; Tehran confirms

In further step away from 2015 deal, Tehran spokesperson says limitations to be placed on inspections by UN watchdog of country's sites

Foreign Ministry spokesman says that despite new law mandating an end to certain types of scrutiny by IAEA monitors, cooperation will continue

Tehran says IAEA must 'prevent paving ground for misunderstanding' after Europeans push back on uranium metal development plan following publication in watchdog's report