Sir Keir Starmer has called for a "lasting" and "workable" agreement on the Strait of Hormuz.
The Prime Minister, along with French President Emmanuel Macron, is hosting a summit of the "coalition of the willing" in Paris this afternoon.
Sir Keir said: "We welcome the announcement that was made during our meeting, but we need to make sure that that is both lasting and a workable proposal.
"And if anything, it reinforces the need for the work that we've been doing this afternoon, because we're very clear that the mission that we're putting together is a defensive mission.
"And that comes after a ceasefire. So that's why we brought the international group together to indicate how we will play our part."
