European leaders and key trading power China have vowed to save the 2015 accord, which lifted sanctions on Iran in return for it halting an alleged nuclear weapons programme and allowing global inspections.
The Iranian Majlis (parliament) on Wednesday condemned the US withdrawal from the 2015 worldwide nuclear deal. While Iranian officials, including the parliament speaker, say they hope Europe will work with them to preserve the deal, many are pessimistic. The U.S. exit from the deal throws billions of dollars of planned European investments into disarray.
Theresa May, Angela Merkel and Emmanuel Macron also committed to ensuring the agreement is upheld, saying in a joint statement that their respective governments would "work with all the remaining parties to the deal to ensure this remains the case including through ensuring the continuing economic benefits to the Iranian people that are linked to the agreement".
Trade Minister Steven Ciobo led a large trade mission in late 2016 to Iran and re-opened the Austrade office in the capital Tehran "to begin rebuilding Australia's commercial relationship with one of the Middle East's biggest economies".
He said at the time that some deal was better than no deal.
"The U.S. pullout from the deal is the best achievement for Iran since it shows the real face of the U.S.", said hard-line lawmaker Ahmad Alirzabeigi.
British Foreign Secretary Boris Johnson urged the U.S.
"But now we have got to seek to persuade him and others there other ways of tackling the challenges he has set out", he said. He said that he wished to discuss the decision with the European, Russian and Chinese parties to the 2015 deal.
Mr Trump said it had been almost 40 years since the regime "seized power and took a proud nation hostage".
Trump yesterday announced that he would be pulling the United States out of the 2015 Iran nuclear deal, calling the agreement "defective at its core".
He said that the "rigorous inspections" were ineffective, as the Iranians prevented inspectors from examining military installations for nuclear materials or the production of nuclear weapons.
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Some other American allies, however, voiced their support for the decision, particularly Israel and Saudi Arabia.
"If they do, there will be very severe consequences", Trump told reporters.
Khamenei described Trump's speech Tuesday announcing his decision as having "over 10 lies", without elaborating on them.
Trump defied European pleas to stay in the pact, which curbs Iran's nuclear program, and reimposed crippling sanctions which will come into effect within six months.
It comes after Iranian politicians set a United States flag ablaze in parliament and shouted "Death to America" after Trump's withdrawal from the nuclear deal.