Their announcement came nearly two weeks after UN sanctions were reimposed on Iran, under a "snapback" process the three European nations had initiated and which became effective from September 28.

Iran has said that, following those revived sanctions, it would not immediately resume nuclear talks.

In their joint statement, Britain, France and Germany said: "We are determined to reinitiate negotiations with Iran and the United States towards a comprehensive, durable and verifiable agreement that ensures Iran never acquires a nuclear weapon."

A spokesman for the Iranian foreign ministry, Esmaeil Baqaei, on Monday said that "we have no plans for negotiations at this stage".

He added that Iran was examining the "consequences and implications" of the restart of sanctions.

"Of course, diplomacy -- in the sense of maintaining contacts and consultations -- will continue," Baqaei said.

"Whenever we feel that diplomacy can be effective, we will certainly make decisions based on the country's interests and priorities," he added.

Western countries, spearheaded by the United States and joined by Israel, accuse Iran of pursuing nuclear weapons -- a charge Tehran has long denied.

The United States on June 22 bombed nuclear sites in Iran, joining an Israeli air campaign against various targets in the country.

France, Germany and Britain -- known as the E3 in the context of negotiations with Iran -- said in Friday's statement that "it was right that the snapback mechanism had been triggered".

"Iran's nuclear program poses a serious threat to global peace and security," they added.

In 2015, the United States, with the three European countries, Russia, and China concluded an agreement with Iran providing for the regulation of Iranian nuclear activities in exchange for the lifting of sanctions.

President Donald Trump decided during his first term in 2018 to withdraw the United States from the deal and to reinstate US sanctions.

In retaliation, Iran pulled back from some of its commitments, particularly on uranium enrichment.

According to the International Atomic Energy Agency (IAEA), Iran is the only country without a nuclear weapons programme to enrich uranium to 60 percent. That is close to the threshold of 90 percent required for a bomb, and well above the far lower level needed for civilian nuclear use.