Around 70 Royal Navy and Royal Marine personnel have joined a French task group aboard the French assault ship FS Mistral for the five-month mission.
It includes port calls in Singapore, Sri Lanka, Vietnam, Japan, Guam and Australia.
Two Royal Navy Merlin Mk3 helicopters have joined the deployment, which will include amphibious exercises and defence engagement.
The UK contribution to France’s annual Jeanne d’Arc naval deployment demonstrates the strength and depth of UK-France ties and our shared commitment to protecting international maritime security.
British and French forces also operate together as members of NATO, with France contributing to the UK-led enhanced Forward Presence deployment to Estonia this year.
The five-month amphibious deployment will take the force – which includes the frigate Courbet – as far east as Japan and Guam, as far south as the northern coast of Australia, with visits to Vietnam, Singapore, Sri Lanka and Djibouti on the 24,000-mile round-trip.