The main focus of the talks in Brussels, which will also be attended by French foreign minister Jean-Yves Le Drian, German counterpart Sigmar Gabriel and European Union high representative for foreign affairs Federica Mogherini, will be the nuclear deal.
President Donald Trump to decide whether to reimpose oil sanctions lifted under the agreement, the EU's top diplomat Federica Mogherini convened the meeting with the European powers to show support for the nuclear deal in a message to Washington, diplomats and officials said.
French Foreign Minister Jean-Yves Le Drian is to raise Paris' concerns about the deal as well as its ballistic missile program while also seeking to keep dialogue open with Iran, a spokesman told journalists.
Iran, which on Monday warned the world to get ready for Washington abandoning the deal, has said if the US walks away from the agreement it is ready to give an "appropriate and heavy response".
Under the agreement, Iran has agreed to dramatically reduce its stockpile of enriched uranium and cut the number of gas centrifuges it operates to produce the nuclear ingredient, with strict limits on other nuclear technologies like heavy water.
Many of Trump's top aides have reportedly been urging him to extend USA sanctions relief, but Trump remained reluctant on January 10.
"It is vital that we continue to work with our European partners to preserve the Iran deal, and with it the security and prosperity it is bringing to the people of Iran and the world", he said. "You either waive the sanctions or you don't and if you don't you're in breach", an anonymous official said.
"All parties should uphold the deal", he said, speaking through a translator.
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"We would argue differently", Ibsen adds, suggesting that the Iran deal is "a temporary stopgap measure to the threat posed by the regime's nuclear vision". Iran has also given the IAEA regular access to its nuclear facilities to observe compliance.
Critics of the deal in Congress have also proposed amending legislation to ensure that U.S. sanctions would "snap back" automatically if Iran carried out certain actions.
"As a result, I think it is unlikely that even Mr. Trump know what he is going to do with the JCPOA and accordingly the Europeans can not guess what he is going to do", noted the top diplomat.
His decision is also further complicated by recent mass anti-government protests in Iran, made up mostly of youths complaining of economic hardship.
"I don't think that anybody has produced a better alternative to the JCPOA as a way of preventing the Iranians from going ahead with the acquisition of a military nuclear capability", he said.
In October, he refused to certify Iran was complying with the deal but stopped short of withdrawing from it, instead passing the issue of reimposing the sanctions to Congress.
Kamalvandi said, "If suspension of the sanctions will not be extended, Iran will take the first retaliatory action immediately".