That's a great question.
Japan is a very interesting partner for the United States as well as for the ASEAN states. Part of Japan's advantage, so to speak, and this is where it has a different advantage compared to other states, is the economics. Think about Japan's presence in Southeast Asia. Early on it was very prominent, beginning in the late 1970s, 1980s. That's a long history as well. Japan, of course, being constitutionally constrained historically since the end of World War II, has also emphasized other tools of engagement. It's diplomatic, and it's also economic.
In terms of how it's influenced, if you think about it, whether it is governmental or non-governmental linkages and feedback, Japan has used its close relationship with the United States to channel some of those ideas back. One good example is the Quad. The Quad has gone through several iterations. The latest iteration has a lot of content that ASEAN can get on board with. ASEAN was extremely concerned when the Quad was first rejuvenated, but under the current iteration, which emphasizes non-traditional security and economics and has become less militarized, the Quad has become much more acceptable. That's different from AUKUS, and that, again, I would argue was something that Japan had no small part in doing.