"This will be strictly peaceful and defensive, as a mission to reassure commercial shipping and support mine clearance," Starmer said alongside French President Emmanuel Macron.

The plan also aims to calm global energy markets after US-Iran tensions, the British PM added, urging nations with an interest in the free flow of global trade to join.

US President Donald Trump said on Truth Social that NATO and its European allies should stay away from the Strait of Hormuz. He criticized NATO allies and said the situation there is under US control. European officials have not yet responded.