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But Mr. Raab also said that he had spoken to Iraq’s prime minister and president to urge a de-escalation of tensions in the region, and that he planned to speak to Iran’s foreign minister.

In particular, the Europeans are trying to persuade Iran to keep to the 2015 nuclear deal, known as the Joint Comprehensive Plan of Action, which Mr. Trump pulled the United States out of in May 2018, reimposing harsh economic sanctions on Tehran. Since then, Iran has slowly abandoned its adherence to parts of the deal.

On Sunday, a Foreign Ministry spokesman, Abbas Mousavi, said Iran was ready to decide its next step to further roll back its commitments to the deal. The National Security Council would hold an emergency meeting Sunday evening to make a final decision about the nuclear deal, he said.

“There will be an important meeting tonight about decreasing our commitments in J.C.P.O.A., taking the fifth step and making a final decision,” Mr. Mousavi said, according to the state news agency IRNA, using the acronym for the nuclear deal.

The Europeans are also working to keep the Strait of Hormuz open to shipping. About one-third of the world’s oil tankers use the waterway, which Iran has intermittently threatened to close. Last July, Iranian forces boarded and seized a British-flagged tanker in the Strait, trying to pressure the world to allow its oil exports despite American sanctions.

On Saturday, Britain’s defense minister, Ben Wallace, said he had ordered the country’s Navy to accompany all British-flagged ships through the Strait of Hormuz.

France has also stepped up diplomatic initiatives to ease tensions. Mr. Macron spoke to President Barham Salih of Iraq and the de facto ruler of the United Arab Emirates, Crown Prince Mohammed bin Zayed of Abu Dhabi.