European countries have 60 days to provide "guarantees" to safeguard Iran's interests, after the United States withdrew from the 2015 nuclear deal, Tehran's parliament's website said quoting an Iranian official.
"We hope that with this visit to China and other countries we will be able to construct a clear future design for the comprehensive agreement", Zarif said, speaking alongside his Chinese counterpart, Wang Yi.
Iran says its nuclear program is for peaceful purposes only.
British Prime Minister Theresa May and U.S. President Donald Trump agreed in a phone call on Friday that talks were needed to discuss how U.S sanctions on Iran would affect foreign companies operating in the country.
And Germany said it will spend the next few months trying to persuade Washington to change its mind. "It depends on the conduct of other governments".
China's Foreign Ministry on May 13 said Zarif will "exchange views with relevant parties on the developments of the Iranian nuclear issue".
In a live press statement in Rome on Tuesday, Mogherini slammed U.S. President Donald Trump's decision to ditch the deal, vowing that "the European Union is determined to preserve it".
Germany's minister for economic affairs, Peter Altmaier, said on Sunday that Berlin will try to "persuade the US government to change its behaviour".
Fellow signatories to the deal have been quick to denounce Trump's decision. On Saturday, French President Emmanuel Macron told Trump in a telephone call that he was anxious about stability in the Middle East, according to Macron's office.
This was part of the flaw of the deal to entice Europe and the United States into economic relations with Iran that eventually would have worked against really holding Iran accountable for violations of the deal. Bolton said on ABC's "This Week". "The policy of the administration is to make sure that Iran never gets close to deliverable nuclear weapons".
"We could have pushed the Europeans a lot harder, to work with us", Gates said on "Face the Nation".
Asked if the US would consider imposing sanctions on European nations that continue to honor the deal, Bolton said "it's possible".