Longtime readers will remember that we’ve actually already talked about “realism” as a school of international relations study before, in the context of our discussion of Europa Universalis. But let’s briefly start out with what we mean when we say IR realism (properly “neo-realism” in its modern form): this is not simply being “realistic” about international politics. “Realism” is amazing branding, but “realists” are not simply claiming that they are observing reality – they have a broader claim about how reality works.

Instead realism is the view that international politics is fundamentally structured by the fact that states seek to maximize their power, act more or less rationally to do so, and are unrestrained by customs or international law. Thus the classic Thucydidean formulation in its most simple terms, “the strong do what they will, the weak suffer what they must”,¹ with the additional proviso that, this being the case, all states seek to be as strong as possible.

If you accept those premises, you can chart a fairly consistent analytical vision of interstate activity basically from first principles, describing all sorts of behavior – balancing, coercion, hegemony and so on – that ought to occur in such systems and which does occur in the real world. Naturally, theory being what it is, neo-realist theory (which is what we call the modern post-1979 version of this thinking) is split into its own sub-schools based on exactly how they imagine this all works out, with defensive realism (“states aim to survive”) and offensive realism (“states aim to maximize power”), but we needn’t get into the details.

So when someone says they are a “foreign policy realist”, assuming they know what they’re talking about, they’re not saying they have a realistic vision of international politics, but that they instead believe that the actions of states are governed mostly by the pursuit of power and security, which they pursue mostly rationally, without moral, customary or legal constraint. This is, I must stress, not the only theory of the case (and we’ll get into some limits in a second).

The first problem with IR Realists is that they run into a contradiction between realism as an analytical tool and realism as a set of normative behaviors. Put another way, IR realism runs the risk of conflating “states generally act this way”, with “states should generally act this way”. You can see that specific contradiction manifested grotesquely in John Mearsheimer’s career as of late, where his principle argument is that because a realist perspective suggests that Russia would attack Ukraine that Russia was right to do so and therefore, somehow, the United States should not contest this (despite it being in the United States’ power-maximizing interest to do so). Note the jump from the analytical statement (“Russia was always likely to do this”) to the normative statement (“Russia carries no guilt, this is NATO’s fault, we should not stop this”). The former, of course, can always be true without the latter being necessary.

I should note, this sort of “normative smuggling” in realism is not remotely new: it is exactly how the very first instances of realist political thought are framed. The first expressions of IR realism are in Thucydides, where the Athenians – first at Corinth and then at Melos – make realist arguments expressly to get other states to do something, namely to acquiesce to Athenian Empire. The arguments in both cases are explicitly normative, that Athens did not act “contrary to the common practice of mankind” (expressed in realist dog-eat-dog terms) and so in the first case shouldn’t be punished with war by Sparta and in the latter case, that the Melians should submit to Athenian rule. In both cases, the Athenians are smuggling in a normative statement about what a state should do (in the former case, seemingly against interest!) into a description of what states supposedly always do.

I should note that one of my persistent complaints against international relations study in political science in general is that political scientists often read Thucydides very shallowly, dipping in for the theory and out for the rest. But Thucydides’ reader would not have missed that it is always the Athenians who make the realist arguments and they lost both the arguments [AND] the war. When Thucydides has the Melians caution that the Athenians’ “realist” ruthlessness would mean “your fall would be a signal for the heaviest vengeance and an example for the world to meditate upon”² the ancient Greek reader knows they are right, in a way that it often seems to me political science students seem to miss.

And there’s a logical contradiction inherent in this sort of normative smuggling, which is that the smuggling is even necessary at all. After all, if states are mostly rational and largely pursue their own interests, loudly insisting that they should do so seems a bit pointless, doesn’t it? Using realism as a way to describe the world or to predict the actions of other states is consistent with the logical system, but using it to persuade other states – or your own state – seems to defeat the purpose. If you believe realism is true, your state and every other is going to act to maximize its power, regardless of what you do or say. If they can do otherwise than there must be some significant space for institutions, customs, morals, norms or simple mistakes and suddenly the air-tight logical framework of realism begins to break down.

That latter vision gives rise to constructivism (“international relations are shaped by ideology and culture”) and IR liberalism (“international relations are also shaped by institutions, which can bend the system away from the endless conflict realism anticipates”). The great irony of realism is that to think that having more realists in power would cause a country to behave in a more realist way is inconsistent with neo-Realism which would suggest countries ought to behave in realist ways even in the absence of realist theory or thinkers.

In practice – and this is the punchline – in my experience most “realists”, intentionally or not, use realism as a cover for strong ideological convictions, typically convictions which are uncomfortable to utter in the highly educated spaces that foreign policy chatter tends to happen. Sometimes those convictions are fairly benign – it is not an accident that there’s a vocal subset of IR-realists with ties to the CATO Institute, for instance. They’re libertarians who think the foreign policy adventures that often flew under the banner of constructivist or liberal internationalist label – that’s where you’d find “spreading democracy will make the world more peaceful” – were really expensive and they really dislike taxes. But “we should just spend a lot less on foreign policy” is a tough sell in the foreign policy space; realism can provide a more intellectually sophisticated gloss to the idea. Sometimes those convictions are less benign; one can’t help but notice the realist pretensions of some figures in the orbit of the current administration have a whiff of authoritarianism or ethnocentrism in them, since a realist framework can be used to drain imperial exploitation and butchery of its moral component, rendering it “just states maximizing their power – and better to be exploiter than exploited”.

One question I find useful to ask of any foreign policy framework, but especially of self-claimed realist frameworks is, “what compromise, what tradeoff does this demand of you?” Strategy, after all, is the art of priorities and that means accepting some things you want are lower priority; in the case of realism which holds that states seek to maximize power, it may mean assigning a high priority to things you do not want the state to do at all but which maximize its power. A realism deserving of the name, in applied practice would be endlessly caveated: “I hate, this but …” “I don’t like this, but …” “I would want to do this, but …” If a neo-realist analysis leads only to comfortable conclusions that someone and their priorities were right everywhere all along, it is simply ideology, wearing realism as a mask. And that is, to be frank, the most common form, as far as I can tell.

That isn’t to say there is nothing to neo-realism or foreign policy realists. I think as an analytical and predict tool, realism is quite valuable. States very often do behave in the way realist theory would suggest they ought, they just don’t always do so and it turns out norms and expectations matter a lot. Not the least of which because, as we’ve noted before, the economic model on which realist and neo-realist thinking was predicted basically no longer exists. To return to the current Ukraine War: is Putin really behaving rationally in a power-maximizing mode by putting his army to the torch capturing burned out Ukrainian farmland one centimeter at a time and no faster? It sure seems like Russian power has been reduced rather than enhanced by this move, even though realists will insist that Russia’s effort to dominate states near it is rational power-maximizing under offensive realism.

Bret Devereaux, “Fireside Friday, June 27, 2025 (On the Limits of Realism)”, A Collection of Unmitigated Pedantry, 2025-06-27.

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1. Thuc. 5.89.
2. Thuc. 5.90.