At the Shanghai Cooperation Organisation (SCO) summit in Bishkek this week, Iranian President Masoud Pezeshkian received precisely the kind of political support he had hoped for. The SCO condemned the military attacks against Iran, described them as violations of international law and the UN Charter, reaffirmed Iranian sovereignty and territorial integrity, and called for the conflict to be resolved through political and diplomatic means.

But the organisation did not offer to defend Iran. That distinction between political solidarity and collective defence is important. It tells us something not only about the Iranian experience with the SCO, but about the international order that is emerging around it.

For years, discussions about multipolarity have often suggested that the US-led international system would gradually be challenged by an alternative bloc centred around China, Russia and organisations such as BRICS and the SCO. From the perspective of middle powers, joining both institutions seemed to fit neatly into this transformation. Integration into non-Western organisations was supposed to make them less vulnerable to Western isolation and pressure.

The US-Israeli war on Iran has made clear that none of these alternative relationships can produce a security guarantee comparable to those provided by formal military alliances. The lesson is not that multipolarity has failed middle powers. It is that the emerging multipolar order may work differently from what many expected.

Rather than replacing one alliance system with another, it is producing an increasingly dense network of overlapping partnerships in which states gain diplomatic and economic options without necessarily acquiring new security guarantees.

For middle powers, this may be one of the defining characteristics of the emerging order: more room for manoeuvre, but less certainty........

© Al Jazeera