Iran's President Mahmoud Ahmadinejad says his country "does not give a damn" about UN resolutions seeking to curb Tehran's nuclear programme.
He was speaking as the UN nuclear watchdog prepared to report to the Security Council on whether Iran had met demands to halt uranium enrichment.
Iran insists it will not abandon its right to enrich nuclear fuel for what it says are wholly peaceful purposes.
The US says the UN must take action if Iran is found not to have complied.
The US secretary of state says the Security Council's credibility is on the line over its handling of the issue.
The US fears Iran will use the fuel to build a nuclear bomb and has not ruled out armed action against Iran.
'Unity and firmness'
President Ahmadinejad told a rally in north-west Iran on Friday: "Those who want to prevent Iranians from obtaining their right, should know that we do not give a damn about such resolutions."