(AFP) -- The European Union and the foreign ministers of Britain, Germany and France will unite to defend the accord but US President Donald Trump has repeatedly criticised the deal and threatened to leave.
While EU diplomatic chief Federica Mogherini wants to keep the nuclear issue separate from other contentious issues with Tehran, Iranian Foreign Minister Mohammad Javad Zarif will also face questions about recent unrest in Iran.
Trump, who in October refused to certify Iran was complying with the deal but stopped short of withdrawing from it, is expected to decide on Friday whether to extend waivers on nuclear-related sanctions against Tehran.
The EU and other world powers have repeatedly warned it would be a mistake to abandon the deal, thrashed out with Iran over 12 years by the US, Britain, France, China, Germany and Russia.
British foreign minister Boris Johnson called the deal "a crucial agreement that makes the world safer".
"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.
Iran warning
According to two US sources, Trump had not made a decision by Wednesday, while Johnson told the British parliament on Tuesday that London was urging "our friends in the White House not to throw it away".
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".
Zarif, who travelled to Moscow on Wednesday criticised what he called Washington's "destructive policy".
"The United States must understand the unity of the international community over the nuclear deal and change their position as a result," Zarif said, urging world powers to "resist the hostile actions" of the Trump administration.
The International Atomic Energy Agency (IAEA) has repeatedly said Iran is keeping up its side of the agreement, most recently in November.
after talks in Moscow on Wednesday Zarif tweeted a warning.
"Everyone agrees it is imperative that ALL live up to their obligations under JCPOA. IAEA has verified Iran's full compliance, but continuation will depend on full US compliance," he wrote. JCPOA is the official name for the deal.
Mogherini, who played an important role in crafting the nuclear accord, has vowed to preserve the deal and has lobbied US lawmakers in Washington.
US Congress is working on a way to punish Iran for its continuing ballistic missile programme.
Johnson said these issues would be "an important part of our conversation" in Brussels on Thursday -- along with the recent unrest in Iran.
(Photo: AFP)