The Association of Southeast Asian Nations (ASEAN) has signalled a notable shift in its posture toward the Quad, sending what analysts describe as a pointed message to China through developments at the 16th Foreign Ministers' Meeting of the East Asia Summit (EAS) held in Manila. The forum, comprising 19 countries, served as the backdrop for a meeting of Quad Foreign Ministers on its sidelines — an engagement that, according to a report by The Diplomat, marks a meaningful loosening of ASEAN's historically cautious distance from the grouping.

What Happened in Manila

On the sidelines of the EAS Foreign Ministers' Meeting, the Quad Foreign Ministers convened and issued a dedicated joint statement on cooperation with ASEAN. The statement reiterated commitments first unveiled at the 11th Quad Foreign Ministers' Meeting in New Delhi. In it, the Quad nations described themselves as 'ASEAN Comprehensive Strategic Partners' and explicitly noted 'the practical implementation of the ASEAN Outlook on the Indo-Pacific' as part of their shared agenda.

According to the report, this opened the door to a more substantive relationship between the two groupings — an achievement the report argues should not be underestimated, given that ASEAN has spent much of the past year navigating internal questions about drift and division.

The Signal to Beijing

China is a full participant in both the East Asia Summit and the ASEAN Regional Forum, and has repeatedly characterised the Quad as an 'Asian NATO', making its discomfort with the grouping publicly known. Against that backdrop, ASEAN's willingness to accept the Quad's effort to insert itself as a stakeholder with a collective regional interest carries considerable weight.

The Diplomat report stated: 'The signal emerging from ASEAN is just as important, and arguably braver. The bloc communicated to Beijing that it is not afraid to engage the Quad, and that it might like to do more of that. The visible loosening of ASEAN's reflex to keep the Quad at arm's length will not be lost on Beijing.'

Notably, the report also observed that the Manila meeting appeared to shed the Quad's longstanding hesitation about being seen as openly confronting Beijing — a posture it had maintained to avoid the perception of enraging China despite being widely understood as a strategic counterweight.

Areas of Potential Cooperation

The report identified disaster response and maritime domain awareness as natural starting points for deeper Quad-ASEAN cooperation — areas that sidestep the more politically sensitive questions around great-power rivalry.

Specifically, it suggested that the Quad and ASEAN could establish a regional rapid-response protocol covering coordination, logistics, and emergency communications. On the maritime front, the report pointed to the Indo-Pacific Partnership for Maritime Domain Awareness (IPMDA), launched in 2022, through which the Quad already provides maritime tracking data to select ASEAN states. The report proposed this could be formalised into a regular, bloc-wide information-sharing arrangement.

Broader Context

ASEAN has historically prioritised centrality and avoided becoming an arena for great-power competition. The bloc's engagement at Manila, therefore, represents a calibrated but consequential step. The report acknowledged that ASEAN will continue to face dilemmas regarding China and its regional actions, and that the framing of the Quad as 'not an anti-China grouping' remains strategically useful — even as the grouping's regional footprint expands.

How Beijing responds to this visible shift in ASEAN's calculus is likely to shape the next phase of Indo-Pacific diplomacy.