Advertisement'Quad' Summit: Biden Looks To Boost Coordination Against ChinaMarch 11, 2021John RuwitchfacebookEmailAircraft carriers and warships participate in the second phase of Malabar naval exercise, a joint exercise by India, the U.S., Japan and Australia, in the northern Arabian Sea last November. The four countries form the Quadrilateral Security Dialogue, or the Quad. (via AP)