PARIS — French President Emmanuel Macron and British Prime Minister Keir Starmer will co-host a videoconference Friday to map out a plan to secure the Strait of Hormuz, their offices said.

The two leaders are to lead talks on forming a “multilateral and purely defensive mission” that would help “restore freedom of navigation in the Strait of Hormuz when the security conditions allow it,” the Elysée Palace said in a statement.

The statement said that “non-belligerent” countries ready to contribute to the mission would participate. Neither London nor Paris specified which other countries are expected to be on the call.

After peace talks over the weekend between Tehran and Washington failed to deliver an agreement, President Donald Trump said the United States would blockade ships entering or leaving the strait to ratchet up pressure on Iran to strike a deal to curtail its nuclear program and open the vital waterway to maritime traffic.

But France and the U.K. have signaled their disapproval of Trump’s latest attempt to strong-arm Iran.

Friday’s summit is aimed at “driv[ing] forward the international effort we have built in recent weeks to ensure freedom of navigation,” said a spokesperson for the British prime minister. But it’s unclear how the Franco-British offer will help dial down tensions.

U.S.-Israeli strikes on Iran in February triggered a regional conflict in the Middle East and brought navigation in the Strait of Hormuz to a virtual standstill, pushing oil and gas prices up across the globe. The two sides agreed to a two-week ceasefire before talks over the weekend of a wider deal fell apart.