Iran Foreign Minister Mohammad Javad Zarif said he hoped for a "clear future design" of the deal as he began a series of diplomatic tours aimed at rescuing the agreement.
Iran's foreign minister on Monday released a letter he sent to the United Nations secretary general accusing the U.S. of "a complete disregard for global law" over its withdrawal from the nuclear deal.
"We will look at potential options for supporting continued sanctions relief for Iran to ensure we meet our commitments under the deal, as well as calling on Iran to continue to abide by the restrictions the deal places upon their nuclear program", he said.
US President Donald Trump said on Tuesday that the United States was withdrawing from a 2015 deal negotiated by the Obama administration. "They were dishonest actors - so the deal... was made on things that were not accurate, particularly the fact that Iran's nuclear capability was far more advanced and further along than they indicated".
The results of negotiations between the Iranian and European experts is expected to be submitted to foreign ministers.
Those comments were echoed by Foreign Secretary Boris Johnson who told parliament that regime change in Iran was not a policy Britain should pursue.
Mogherini said "the aim" is to see how Iran and the Europeans "can coordinate actions" in order to preserve the deal.
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In the U.S., National Security Adviser John Bolton raised the pressure on Europe, saying that countries and companies that continue to do business with Iran could face sanctions.
Senator Graham said he's open to a new deal with Iran that would strictly limit the Islamic Republic's enrichment levels to nuclear power generation.
The EU's executive arm, the European Commission, has been examining measures to counter the introduction of any USA sanctions that might harm European businesses and is expected to unveil them to EU leaders at a meeting in Bulgaria on Wednesday.
"We remain in the agreement and we want to keep it alive, as long as Iran respects it", he added, describing the agreement as "win-win".
They include retaliatory sanctions, allowing the European Investment Bank to invest directly in Iran and coordinating euro-denominated credit lines from European governments.
"It is going to be very hard for us to preserve the economic benefits of the Iran deal", one senior European diplomat said.
They could consider retaliatory sanctions using the EU's so-called blocking statute that bans any European Union company from complying with USA sanctions and does not recognise any court rulings that enforce American penalties.