Iran is prepared for all possible scenarios if U.S. President Donald Trump scraps a nuclear deal reached between Tehran and six major powers in 2015, a senior Iranian official told Reuters on Wednesday.

French President Emmanuel Macron hit back at U.S. President Donald Trump on Tuesday staunchly defending the “good” Iran nuclear deal saying that those who did not respect it were irresponsible.

The fate of the nuclear agreement with Iran is dominating this week’s United Nations General Assembly as European officials will attempt to persuade US President Donald Trump to maintain the agreement.

United States Secretary of State Rex Tillerson is expected to hold a firstmeeting on the Iran nuclear deal with Foreign Minister Mohammad Javad Zarif and other parties to the agreement next week at the United Nations, diplomats said on Thursday.

France’s foreign minister said on Wednesday he was worried that U.S. President Donald Trump could put into doubt a nuclear deal between Iran and a group of major world powers.

Iran has dismissed a U.S. demand for United Nations nuclear inspectors to visit its military bases as “merely a dream”.

Iran can resume high-level uranium enrichment within five days if the United States tears up the nuclear deal, the head of its Atomic Energy Organisation said Tuesday.

Iran said new sanctions imposed by U.S. President Donald Trump on Wednesday break the terms of its nuclear deal with the United States and other world powers, and vowed an "appropriate and proportional" response.

Iran said on Thursday that new U.S. sanctions targeting its ballistic missile program show Washington's "ill will" and could undermine the 2015 nuclear deal between Tehran and world powers, state television reported.

Iran said on Tuesday it had sent 11 metric tonnes of heavy water to Oman as part of its obligations under last year's nuclear deal with world powers, agencies reported.