Iran and the European Union will hold a ministerial meeting in Brussels next week following the U.S. pullout from an international deal on Tehran's nuclear development, a senior Iranian diplomat told Kyodo News on Thursday.

Foreign ministers of Iran and three European countries -- Britain, France and Germany -- and Federica Mogherini, high representative of the European Union for foreign affairs and security policy, will meet on Tuesday to discuss the new situation after the U.S. withdrawal, the diplomat said on condition of anonymity.

In the one-day meeting, Iran will seek the European Union's "practical guarantees" stressed by Iranian President Hassan Rouhani and Supreme Leader Ayatollah Ali Khamenei as the only way to salvage the Iran nuclear deal, he added.

(Federica Mogherini (L) and Mohammad Javad Zarif, hold a press conference in Vienna on July 14, 2015)

While withdrawing on Tuesday from the accord struck under his predecessor Barack Obama, U.S. President Donald Trump pledged "the highest level of economic sanction" against the Iranian regime, which he called "the leading state sponsor of terror."

President Hassan Rouhani said Tuesday that Iran will remain in the 2015 pact temporarily to negotiate with the other six parties -- Britain, France, Germany, the European Union, Russia and China -- and study the possibility of keeping it alive.

Meanwhile, speaking on the phone with French President Emmanuel Macron on Wednesday, Rouhani said Europe has a very limited time to save the pact and must determine and announce its clear, firm stances on its obligations in the deal.

Under the pact formally called the Joint Comprehensive Plan of Action, Tehran agreed to curb its nuclear activities in exchange for the lifting of crippling economic sanctions.

Khamenei, who has the last word on crucial issues, said Wednesday, "It is said that we will continue with three European countries -- France, Germany and Britain. I don't trust these three either and you should not trust them."

He said the JCPOA's survival depends on "practical guarantees" that Iran must seek from the European Union to preserve Iran's benefits.

"If you can't gain practical guarantees from Europeans, which I think is not likely, it won't be possible to continue the JCPOA," he said.

Russian Deputy Foreign Minister Sergei Ryabkov met with his Iranian counterpart Abbas Araghchi in Tehran on Thursday to discuss the latest development over the Iran deal.

Iranian media reported that Foreign Minister Javad Zarif will visit the Chinese and Russian capitals on Saturday and Monday, respectively, before arriving in Brussels.