Iran's Foreign Minister Mohammad Javad Zarif has hailed talks between Iran and the EU over salvaging the nuclear deal as a "good start."

Iran and European powers have made a good start in talks over how to salvage the 2015 nuclear deal but much depends on what happens in the next few weeks, Zarif said on Tuesday after a 90-minute meeting with the foreign ministers of Britain, France and Germany and the European Union's foreign policy chief in Brussels.

"We are on the right track ... a lot will depend on what we can do in next few weeks," said Zarif.

He added that progress had been made towards a political agreement on measures that should be taken to keep the nuclear deal in place following Washington's withdrawal.

"Constructive meeting with EU High Rep & E3 ministers in Brussels, following successful Beijing & Moscow visits. Positive start with solid political commitments. All agreed that much remains to be done in coming weeks to practically guarantee economic benefits for Iranian people," tweeted Zarif following the meeting.

Before meeting with his European counterparts,  Iranian Foreign Minister  said ,powers must give Iran guarantees that it will get the economic benefits of the deal, warning there was not much time for them to deliver those assurances.

The Iranian foreign minister is in Brussels on the final leg of a whirlwind diplomatic tour, which has already taken him to Beijing and Moscow.

British Foreign Secretary Boris Johnson said before the meeting with Zarif that Britain and its European partners "continue to view the nuclear deal as vital for our shared security, and remain fully committed to upholding it."

"We want to hear what expectations there are in Iran," German Foreign Minister Heiko Maas said. "We will look for ways in which we can make sure that in Iran the deal can still be supported from a domestic political perspective."

U.S. President Donald Trump pulled out on May 8, claiming that Iran had violated the "spirit" of the deal.