Why Some Alliances Last and Others Collapse
The difference is not loyalty, shared values, or good intentions. It is whether four specific conditions are met.
On the night of August 23, 1939, Germany and the Soviet Union signed a non-aggression pact in Moscow. Joachim von Ribbentrop, Hitler’s foreign minister, flew to the Soviet capital. Stalin toasted the Führer. Photographs were taken. The agreement divided Eastern Europe into spheres of influence and removed the threat of a two-front war that had haunted German strategic planning since the nineteenth century.
Less than two years later, on June 22, 1941, Germany invaded the Soviet Union in the largest military operation in human history. Operation Barbarossa was launched without warning, without ultimatum, and without any of the pretexts that Germany had used in previous violations of its international commitments. The pact that had reshaped European politics overnight was simply discarded when it was no longer useful.
No one who understood why the Molotov-Ribbentrop Pact was signed should have been surprised that it was broken. It was not an alliance in any meaningful sense. It was an arrangement of pure convenience between two states whose interests happened to converge for a specific period and in a specific way. When the convergence ended, the arrangement ended. The only question was which side would act first.
The Molotov-Ribbentrop Pact is an extreme case. But the logic it illustrates operates across the entire history of international coalitions. Some arrangements hold for a season. Others hold for a century. The difference is not friendship. It is not shared values, in any simple sense. It is not the quality of the diplomats who negotiated the agreement or the eloquence of the founding documents. The difference lies in whether the conditions that produce durable collective action are actually present. When they are, alliances can become something more than alliances. When they are not, every alliance is, at bottom, a temporary arrangement waiting for the conditions that created it to change.
The Standard Explanations and Why They Fall Short
Ask most people why some alliances last and others collapse, and you will get one of three answers.
The first answer is shared values. Democracies stick together because they believe in the same things. Authoritarian states cooperate because they fear the same enemies. The alliance holds as long as the values hold.
The second answer is shared interests. States cooperate when cooperation serves their interests and defect when it does not. The alliance is a transaction, more durable when the transaction is mutually beneficial, fragile when one side finds a better offer elsewhere.
The third answer is institutional design. A well-designed alliance, with clear rules, burden-sharing mechanisms, and dispute resolution procedures, lasts longer than a poorly designed one. NATO has endured because it was built carefully. The Warsaw Pact collapsed because it was built on coercion.
Each of these answers contains something true. Shared values do create deeper bonds than pure interest convergence. Institutional design does affect durability. Mutual interest is obviously relevant to whether states cooperate at all.
But none of these answers is sufficient, and together they still leave the most important question unanswered: why do some states, facing the same structural pressures and with comparable institutional arrangements, manage to build collective actors of genuine and lasting coherence, while others, starting from apparently similar positions, fail?
The answer requires a different framework, one that goes deeper than values, interests, or institutions, to the structural conditions that make durable collective sovereignty possible or impossible.
The Four Conditions
There are four conditions that must be simultaneously present for collective sovereignty to be durable. Each is necessary. None is sufficient alone. When all four are present, collective actors can become something qualitatively different from an alliance: a genuine expression of shared power that outlasts the immediate pressures that created it. When any one of the four is missing, the collective arrangement remains a temporary coalition, however elaborate its institutional architecture.
The first condition is structural coercion. The states involved must face a pressure that none of them can adequately address independently. This pressure must be real and objective, not merely perceived, and it must be of sufficient magnitude that the costs of collective action are clearly lower than the costs of acting alone. Structural coercion is what drives states to the table. Without it, the incentive to bear the costs of integration, the sovereignty transfers, the political compromises, the institutional obligations, is too low. States cooperate most deeply when the alternative is genuinely dangerous.
But structural coercion alone produces only what it produces: a coalition held together by external pressure. When the pressure lifts, the coalition relaxes. If structural coercion were sufficient, the Allied coalition of the Second World War would have deepened into genuine integration after 1945. Instead, it dissolved within two years into the Cold War confrontation, as the shared pressure of Nazi Germany was replaced by the diverging interests of the United States and the Soviet Union. Structural coercion is the starting condition. It is not the sustaining one.
The second condition is civilizational substance. The states involved must share a common foundation that is not the product of the current crisis but has been growing over a longer historical period: compatible legal traditions, cultural affinities, or a shared understanding of what legitimate political order looks like. This shared foundation does not require homogeneity. The states need not be identical in language, religion, or political system. What they need is a common frame within which their differences can be negotiated without the negotiation itself becoming an existential conflict.
Civilizational substance cannot be created by political decision. It can be cultivated, strengthened, or weakened over time. But it cannot be decreed. An agreement to be alike is not the same as actually being alike in the ways that matter for durable collective action. This distinction will become clearer in the historical cases that follow in later essays, particularly the contrast between the European Union, where civilizational substance was genuinely present even if imperfectly distributed, and the Arab League, where a surface commonality of language and religion coexisted with deeply incompatible political traditions and elite structures.
The third condition is compatible elite interests. The political leaderships of the states involved must see a net benefit in transferring sovereignty to the collective level, or at least must not see an existential threat in doing so. Collective sovereignty requires that decisions previously made at the national level be made at the shared level. For political elites whose power rests on national institutions, this transfer is always a potential threat. If the incentive structure does not compensate for this threat, if elites cannot find in collective arrangements a new basis for authority or a new arena for ambition, they will resist integration regardless of how strong the structural pressure and how deep the civilizational substance.
This condition explains a great deal about where integration succeeds and where it fails. It explains why European integration moved furthest in areas where national elites found new sources of authority at the European level, and stalled where integration threatened existing power bases without offering comparable alternatives. It explains why the integration of post-colonial states in Africa and the Middle East has consistently fallen short of what their cultural and historical connections might suggest was possible. The elites of newly independent states had just acquired national power. Sharing it was the last thing they were willing to do.
The fourth condition is border compatibility. The institutional boundaries of the collective actor must roughly correspond to the civilizational boundaries of the shared substance. When political borders cut across civilizational lines, integrating actors who share no common foundation or excluding actors who genuinely belong together, a persistent legitimacy deficit is created that structural pressure alone cannot overcome. The collective actor either incorporates members who cannot genuinely participate in a shared political culture, creating internal friction that grows over time, or it excludes members whose natural affinities pull them toward the group, creating external pressure that distorts the arrangement.
Border compatibility is perhaps the least discussed of the four conditions in conventional analysis of international relations, but it may be the most consequential over the long run. The difficulties of the European Union are partly explicable as a border compatibility problem: successive enlargements incorporated states whose political traditions, economic structures, and expectations of what legitimate European governance looks like diverged significantly from the founding members. The resulting strains are not primarily the product of poor institutional design. They are the product of expanding a collective arrangement beyond the civilizational territory that could sustain it.
Why the Conditions Are Cumulative
The critical feature of this framework is that the four conditions are cumulative. It is not enough to have three out of four. A collective arrangement that meets only the first three conditions, structural coercion, civilizational substance, and compatible elite interests, but lacks border compatibility, will face a persistent crisis of legitimacy that structural pressure cannot resolve. One that meets only the first two, without compatible elite interests, will have the cultural foundation for integration but find it blocked at every decisive moment by leaderships whose personal interests lie elsewhere.
This cumulativeness is what makes genuine collective sovereignty rare. It is not difficult to find cases where states face common external pressure. It is much harder to find cases where external pressure coincides with genuine civilizational substance, compatible elite interests, and appropriate border configurations simultaneously. When all four conditions are met, the result is historically extraordinary. When they are not, the result is the normal outcome of international coalition politics: arrangements that function adequately in ordinary times and fracture under the stress that tests them most.
What This Framework Is For
The framework of four conditions is not a prediction machine. It does not tell you in advance exactly when a collective arrangement will collapse or how deeply it can integrate. What it does is provide a diagnostic instrument, a way of asking the right questions about any collective arrangement in order to understand both its possibilities and its limits.
Applied to historical cases, it explains outcomes that seem puzzling under simpler frameworks. It explains why the United States succeeded where the Articles of Confederation failed. It explains why the Soviet Union, despite enormous institutional investment in collective identity, disintegrated when the coercive pressure sustaining it was removed. It explains why ASEAN has maintained remarkable stability for decades without ever approaching genuine collective sovereignty, and why the explanation for that stability is the same as the explanation for its limits.
Applied to contemporary cases, the framework raises uncomfortable questions that conventional analysis prefers to avoid. Does NATO, in its current form, meet all four conditions? Does the European Union? Does any of the emerging coalitions in the Indo-Pacific or the Global South that are increasingly described as potential counterweights to American or Chinese power?
These questions will be examined in detail as this project develops. But the framework for asking them is established here. Every collective arrangement in international politics can be assessed against these four conditions. The assessment will not always yield a clean answer. But it will always yield a more honest one than the alternatives.
The Lesson of the Pact
Return, finally, to Moscow in August 1939. The Molotov-Ribbentrop Pact met exactly one of the four conditions: there was a convergence of elite interests in the short term, specifically the interests of Hitler in a free hand in the West and of Stalin in time to rearm. It had no civilizational substance, no border compatibility in any meaningful sense, and the structural coercion that united the two states was not common external pressure but merely the temporary absence of immediate conflict between them.
By the standards of the four conditions, it was not a collective arrangement at all. It was a transaction. And transactions end when the terms change.
The arrangements that endure are the ones built on something more than transactions. Understanding what that something more consists of, where it comes from, and under what conditions it can be deliberately cultivated, is the work of the essays that follow.