For Japan, the Quad matters as an organizing concept of its most important Indo-Pacific partners. But Japan’s engagement with them lies outside, rather than within, the Quad framework.
This is for two reasons. First, the Quad is not a security grouping, which limits the degree of defense cooperation the framework will accommodate. Second, since September 2024, there have been no leader-level meetings, only foreign minister meetings in July 2025 and May 2026, which affirmed the four countries’ shared priorities rather than operationalizing new initiatives.
The vital security and economic cooperation between Japan and other Quad members lies outside the framework. The Indian prime minister’s visit to Japan last August highlighted bilateral cooperation in energy, technology, and economic investment. Australia’s decision to purchase Mogami-class frigates from Japan demonstrated the rapidly growing security partnership between the two countries. The U.S.-Japanese alliance remains Japan’s core security and economic relationship — bolstered by Prime Minister Sanae Takaichi’s recent visit to the White House, the $550 billion strategic industrial fund, and the U.S.-Japanese-Australian gallium project.
The Quad remains important for promoting the members’ values of a free and open Indo-Pacific, but Japan prioritizes working directly with these key partners.