Is post-cold war international order finally breaking apart?

For nearly 35 years, the architecture built after 1991, American primacy, a web of alliances, a rules-based trading system, and a United Nations meant to arbitrate disputes among great powers, held, however imperfectly. In 2026, that architecture looks like a system under strain and more like one in active collapse.

War engulfed Israel, the US and Iran. Russia and Ukraine remain locked in their fifth year of fighting even as peace envoys shuttle between Moscow and Kyiv. Washington and Beijing are fighting a tariff war that has repeatedly threatened global auto chains. BRICS, now an 11-member bloc, convenes this weekend (September 12-13, 2026) in New Delhi. And the UN, marking its 80th anniversary this year, is nearly broke.

But beneath these crises sits a pattern getting too little attention: nobody is bothering to reform the old institutions anymore. They’re building parallel ones instead. Rather than one dramatic rupture, 2026 looks like the year the post-Cold War order got forked. And the clearest evidence sits, of all places, in the White House.

Starting with Iran, what began as Israel strikes on Iranian nuclear sites in June 2025 escalated into direct U.S. bombing and a fragile ceasefire. Israel and the U.S. didn’t just bomb Iranian facilities; they killed the head of state himself, along with his defence minister Aziz Nasirzadeh, the Revolutionary Guard commander, and the secretary of Iran’s Security Council, Ali Larijani, in coordinated strikes. That is a qualitatively different act from the deterrence-based standoffs that defined Cold War and post-Cold War power behaviour, where leadership decapitation of a state actor was treated as an unthinkable escalation.

The aftermath suggests the order’s enforcement gap more than the strike itself. Hezbollah dragged Lebanon into a way that has killed more than 4,000 people and displaced over a million, and Houthi strikes on Saudi Arabia wounded 73 people last week, indicating a strike aimed at ending Iran’s regional network instead diffused the conflict across four additional countries, with no multilateral body able to contain the spillover. Moreover, succession also mattered less than the U.S. may have hoped, as Iran stood up an interim leadership council within a day and moved to a new supreme leader rather than collapsing, meaning the “decapitation equals regime change” theory underlying the strike hasn’t been validated.

The same substitution of raw force for institutional process shows up in Ukraine, just conducted through diplomacy rather than munitions. What’s analytically striking about the current round of shuttle diplomacy isn’t that talks are happening- they have happened repeatedly since 2022- but that they are happening without any multilateral institution driving them. Envoys Witkoff and Kushner spent over three hours with Putin on September 6, then went straight to Kyiv, a bilateral, personality-driven process running entirely outside the UN, the OSCE, and any treaty framework built for exactly this purpose.

Putin has reportedly told associates he won’t negotiate seriously until Russia holds the rest of Donbas, meaning the diplomacy is tracking the battlefield rather than shaping it. This is a reversal of how the postwar order was supposed to function, where institutions were meant to constrain territorial conquest, not ratify it after the fact. Civilian casualties in Ukraine rose 31% in 2025 vs 2024, as per the UN Human Rights Monitoring Mission in Ukraine. This itself is a data point on how little deterrent effect four years of sanctions, summits, and UN resolutions have had on Russian targeting of civilian infrastructure.

Between Washington and Beijing, the substitute for institutional process is economic rather than military or diplomatic, but the pattern is identical: neither side is routing its conflict through the body built explicitly to manage it. BRICS extend the same logic from bilateral confrontation to bloc-building, and its real significance in 2026 isn’t its size; it’s its method. 

The bloc’s 18th summit, convening on September 12-13, 2026, groups Brazil, Russia, India, China, South Africa, Egypt, Ethiopia, Iran, the UAE, Saudi Arabia, and Indonesia. This unites a set of economies with wildly different political systems and interests by a shared preference for opting out of Western-run institutions rather than reforming them from within. Rather than campaign for a larger IMF quota, the bloc is building substitute financial infrastructure outright: UPI-linked cross-border payments and greater use of national currencies, aimed at reshaping BRICS trade without needing a single new currency. 

The logic here is simple: Iran and Russia, both heavily sanctioned, have every incentive to prove alternative payment rails can function without Western oversight, and every other BRICS member benefits from having that option exist even if they never use it.

The clearest evidence that institutions are being duplicated rather than reformed is the formation of the “Board of Peace.” Asked directly whether it could replace the UN, Trump said: “it might.” What makes this a genuine structural shift rather than rhetoric is the design choice underneath it. The board gives its chairman what amounts to permanent effective veto power, without the other four permanent Security Council members able to check it.

The evidence of this broader institutional exhaustion is now quantifiable rather than anecdotal, indicating a pattern in which major powers are independently concluding that the costs of remaining within multilateral structures increasingly outweigh the benefits. Alliance behaviour is also adjusting accordingly, suggesting that arrangements once regarded as contradictory or exceptional a decade ago are now becoming normalised features of statecraft.

The most measurable indicators therefore suggest that the post-Cold War order isn’t merely breaking apart; it has already fractured. The more consequential question is no longer whether the old order can be restored, but what form of disorder will emerge in its place. Historically, declining institutions fade slowly, starved of funding while nominally intact. But what’s happening now is structurally different. The world’s most powerful state and its most consequential rising bloc are each constructing working replicas of the systems they’re abandoning, complete with characters and founding members, rather than waiting for the originals to either reform or collapse. 

Two systems, running in parallel, each claiming legitimacy, that isn’t declining. It's a duplication. And duplication, unlike decline, doesn’t resolve on its own.