Defense Minister Shinjiro Koizumi will head to the Philippines from Wednesday for an expanded ASEAN defense ministerial summit, where he plans to hold bilateral talks with his U.S., Philippine and South Korean counterparts.

A meeting with Chinese Defense Minister Dong Jun, however, may not be in the cards.

Koizumi said Tuesday that he would attend the summit through Friday as Japan looks to bolster defense cooperation with its regional partners in the Association of Southeast Asian Nations and elsewhere.

But the summit is also a rare opportunity for Japanese defense officials to meet with their Chinese counterparts — Beijing is part of the expanded ASEAN talks — amid chilly ties between the two Asian powerhouses following Prime Minister Sanae Takaichi’s comments nearly a year ago about the possibility of Tokyo intervening militarily in a crisis over Taiwan.

Koizumi emphasized that Japan is “always open to dialogue,” but said that while he held talks with Dong at last November’s summit, his ministry had…