Speaking alongside Mr le Drian, Mr Johnson said: "The UK and France are determined to conserve the essence of the Iran nuclear deal". Iranian Foreign Minister Javad Zarif is heading out this week on a global tour of major countries, trying to secure diplomatic cooperation from other nations.
US President Donald Trump stated the bargain had been "dreadful" because of expiry dates on its own restrictions and because it did not insure Iran's ballistic missile programme or its own regional sway.
He said the deal "is based on the balance of obligations" between Tehran and the opposite side, including the USA, and that after Washington's pullout "this balance is undermined", adding, "We should see how we can secure the interests of the Iranian people".
Based on Rouhani's order, Foreign Minister Mohammad Javad Zarif is expected to leave Tehran for Beijing on Sunday, May 13 and then to Moscow.
"Since the signing of the JCPOA (nuclear deal), we have gone from an atmosphere like a gold rush, to one of utter depression", said a Western trade diplomat on condition of anonymity.
"The advantages from the Iranians' point of view is that they should have some benefits from economic participation and economic engagement with us in the west".
Nullifying the claim that China was engaging with North Korea more at this moment out of fear of getting sidelined in a US-initiated peace process, it said Beijing was doing so because of its own importance.
Before leaving Iran, Zarif published a government statement via Twitter criticising Trump's "extremist administration" for abandoning "an accord recognised as a victory of diplomacy by the worldwide community".
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Saving the deal is going to rest heavily on ensuring these nations can combine efforts to block United States sanctions from preventing global companies doing business in Iran.
Trump hit back on Saturday evening, tweeting that the accord had failed to contain Iran's militarism.
The move suggests that Beijing, unlike the European Union, is determined to maintain normal ties and trade with Iran, despite the USA urging foreign companies to wind down their operations in the region. They will also discuss overcoming Israeli resistance to Iran's military presence in Syria, TASS reported Monday.
That is part of a flurry of diplomatic activity following Trump's unilateral withdrawal from what he called "a frightful, one-sided deal", a move accompanied by the threat of penalties against any foreign firms doing business in Iran.
"I understand perfectly well that Iran wishes to protect its legitimate interests".
Secretary of State Mike Pompeo said the U.S. still wanted to work with the Europeans on a new deal.
Iran's conservative opposition is aligning increasingly against the deal.