In terms of economic ties, Trump's withdrawal from the Iran's 2015 nuclear agreement has made western European energy companies, already wary of existing USA sanctions against Tehran, fearful of investing in Iran's vast energy resources.
In recent months, USA and European diplomats have agreed on ways to constrain Iran's missile program and discussed how to strengthen inspections of Iran's nuclear program.
French Finance Minister Bruno Le Maire said Friday on Europe-1 radio that Europe should not accept that the U.S.is the "world's economic policeman". Interesting is how the new United States sanctions are targeting the regime, its entities and senior officials, going the Iran apologists camp arguing such measures will hurt the Iranian people.
Just how much of Iran's growth in oil production is at risk - and when it could decline - is uncertain.
"The Russian Federation and other participants of this deal - China, the Europeans - also have legitimate interests that are enshrined in this agreement and approved by the U.N. Security Council", Lavrov said.
Meanwhile, UK Prime Minister Theresa May, French President Emmanuel Macron and German Chancellor Angela Merkel issued a joint statement calling on all other parties to the JCPOA to stay committed to their liabilities under it.
Zarif said the latest US decision was "illegal".
"It is most important to point out that certain elements of Iran's policy in the region, and also its missile program, have aroused the resentment of the United States and its allies", Ryabkov said.
However, Mr Mianji said he viewed the solidarity of the EU countries as a promising sign of the union's loyalty to the nuclear agreement and opposition of Mr Trump's sanctions. The grouping includes Kazakhstan, Belarus, Armenia and Kyrgyzstan.
Despite the United States exit, Britain and Iran expressed their commitment to ensuring that the accord is upheld, according to a statement released by British Prime Minister Theresa May's office.
Several US military officials told CNN that there are increasing concerns Iran is on the cusp of an attack against Israel.
"This deal is not a bilateral treaty".
Mogherini says "there was awareness of the urgency" and the four ministers agreed to find some solutions within weeks.
"I cannot talk about legal or economic guarantees but I can talk about serious, determined, immediate work from the European side", Mogherini said. "It seems that today screaming and shouting, insulting and bullying, systematically destroying and dismantling everything already in place is the mood of our times".
Some fear Europe's room for manoeuvre is limited.
The administration had extended waivers on Iran's nuclear sanctions on multiple occasions to allow for the United States, together with our partners, to fix the fatal flaws of the Joint Comprehensive Plan of Action.
Planemakers Airbus and Boeing, oil companies and auto manufacturers like France's Renault and Peugeot could be among companies hardest hit. He certainly brings a singular style to the nation's highest office, and it has borne some fruit: North Korea is coming to the table to at least discuss denuclearization in a historic June meeting in Singapore; he pushed his party relentlessly to fulfill his campaign promise to overhaul the tax code; and his unprecedented approach has spurred more political involvement and robust debates over civics and social media.
Among things the European Union could consider, he said, are reinforcing a 1996 "blocking statute" that could allow companies to ignore sanctions.
This echoes statements from China, which has also said it wanted to continue normal business ties with Iran and is now financing multi billion dollar infrastructure and electricity projects in the country.