Zarif said this list of commitments has to become "operational" and completed with details, "and then we can decide to what extent Iran's interests can be secured".
Zarif's meetings in Brussels capped a whirlwind global tour, including trips to both Russian Federation and China, the two other signatory nations, in a bid to bolster support.
Meanwhile, the USA treasury has already imposed new sanctions on the governor of the Iranian central bank, Valiollah Seif, and the Iraq-based Al-Bilad Islamic Bank -for allegedly moving millions of dollars to Hezbollah on behalf of Iran's Revolutionary Guards.
In the final analysis, the future of the deal still rests in the hands of the United States and depends on the extent of the European non-submission to the USA dictates and its renewed sanctions on Iran.
After a 90-minute closed-door discussion, the European Union foreign policy chief Mogherini confirmed that the group is looking for a quick practical solution to salvage the agreement and it would reconvene in a week at deputy foreign ministers level.
"Let's not fool ourselves that there are dozens of things we can do", said a senior European diplomat.
Three European Union (EU) powers that signed onto the Iran nuclear deal are in talks with Tehran to keep it in place, despite President Donald Trump's announcement withdrawing the USA from the arrangement.
EU President Donald Tusk said in a letter to EU leaders on May 15 that the summit would "reflect on recent global developments, in particular following President [Donald] Trump's announcement on Iran and trade".
French energy company Total has joined several European companies saying they might end operations in Iran.
By ripping up the Iran nuclear deal on May 8 and targeting the Islamic Republic's energy sector, Donald Trump has unwittingly dealt a blow to the U.S. dollar. Without the U.S., it is going to weaken potential European Union measures to preserve the deal as positively.
Companies engaged in trade in Iran have been threatened with penalties after Donald Trump pulled the United States out of the nuclear deal.
Rouhani said Trump had expected Iran to leave the deal after the U.S. withdrawal, but Tehran had refused to follow that plan by trying to save the deal with its remaining signatories.
The steps forward underscored the EU's hopes that diplomacy and the promise of economic benefits might keep Iran in the fold of a nuclear deal that Europe sees as essential to security.