In November last year, John Mearsheimer stood in front of a conference at the European Parliament in Brussels and told the people in the room that the American guarantee they had built their continent on was going away. Not might. Was. He gave them the reasoning, he gave them the timeline pressure, he gave them a forecast of what Europe would look like afterwards, and then he sat down. He did not tell them what to do about it. I want to be careful here, because there is a version of this argument that is cheap and I am not making it. Mearsheimer is a serious scholar working inside a coherent tradition. He has been saying the same thing since well before it was useful to anyone, which is more than can be said for most of the people now quoting him. And the central claim he makes about Russia — that it is not a potential regional hegemon, that its army is not what the mythology says, that a country grinding through a fourth year to take a fifth of Ukraine is not about to overrun the continent — I am going to grant you in full. Not soften it. Grant it. If you have been persuaded by that argument, you have been persuaded by something with real evidence behind it, and anyone who tells you otherwise is selling you a different kind of story. So here is the model, and here is what would kill it. The claim is that strategic realism has no prescription for Britain — not because its popularisers are lazy, but because the framework itself stops before it reaches us. If Mearsheimer, or any comparable realist, publishes a direct prescription for British policy that runs on structural interest rather than on inherited national temperament, this piece is wrong and I will say so. I looked before writing. It is not there. Consider why it might not be there, because the reason matters more than the absence. Mearsheimer’s theory is a theory of great powers. That is not a slight — it is the stated scope of the thing. On his own current count there are three: America, China, Russia. Britain is not on the list. A theory built to explain how great powers behave toward one another owes no advice to a state that isn’t one, in the same way that a book on how weather systems form owes you nothing about whether to take a coat. The silence is not a failure of the framework. It is the framework working as designed, and stopping where it was always going to stop. Which leaves a gap. And the gap is where the trouble starts, because something always fills it. Watch what fills it when Mearsheimer himself is asked. Three days ago, on an American podcast, he was asked why British policy toward Russia is what it is. His answer was Russophobia — a national disposition, traced back through the Cold War to nineteenth-century imperial anxiety about India, carried forward into the present as inherited feeling. He added that he suspects the new Prime Minister privately knows the policy should change but cannot say so. Take a moment with that, because it is the whole argument in miniature. Structural realism exists to explain state behaviour by position and interest rather than by mood, prejudice, or what leaders secretly believe. It was built specifically to replace explanations of that kind. And when the framework’s most prominent living exponent turns to Britain, he reaches for a cultural-psychological account of a nation’s feelings and a guess about one man’s private mind. Whatever that is, it is not the method. It is the thing the method was invented to get away from. I should say plainly that this comes from a podcast transcript rather than from anything he has published under his own name, and it sits a tier below the Brussels address in what it can be asked to carry. But it is not an outlier. It is what the framework produces when it is pointed at a country it was never built to analyse. So let me do the thing that is not being done, and be clear that this next part is mine. This is my inference from his premises, not his conclusion, and you should weigh it as such. Start with his own foundational move: you can never know another state’s intentions, so you do not stake your survival on anyone’s goodwill. Applied to Russia, that produces caution. Applied honestly, it produces caution about everyone — including the state on whose intentions Britain has staked its deterrent, its intelligence architecture, and a good deal of its industrial base. Mearsheimer spends the Brussels address establishing that American interests have moved. He does not then ask what a dependent state ought to conclude from that. The premise is his. The question is the obvious next one. It is simply never put. Now take his forecast, which is bleaker than the people quoting him tend to mention. He does not predict calm. He predicts European-Russian relations poisoned for as far as anyone can see, an ever-present possibility of war across a run of named flashpoints — the Arctic, the Baltic, the Black Sea — and a Russia with standing incentive to cause trouble inside Europe and to split it from America. That is his picture, offered unprompted, by the analyst you trust. I suspect that is where you want to get off, so let me stay on it. The objection is that Russia has no such incentive — that it is a status quo power with a border problem, that it wants a buffer rather than a project, and that talk of mischief inside Europe is the threat inflation that got us here. Look at what the objection has to assume. The argument you have been persuaded by is that Russia went to war over the European security architecture — over the alliance’s expansion, over Ukraine’s alignment, over where the line sits. I am not going to adjudicate that here, and I do not need to. I need only note that it is the argument you have accepted, and ask what accepting it commits you to. It commits you to this: that Russia cares enough about that architecture to spend four years, an economy and an extraordinary number of its own people trying to change it. You cannot then hold that it is indifferent to whether that architecture is strong or weak. A state that fought a war over the shape of a coalition has an obvious and entirely rational interest in that coalition being more divided, slower to decide, and less certain of its patron. It does not need to hate anyone. It needs only to prefer a weaker adversary bloc to a stronger one, which is the most ordinary thing a state can want, and to notice that some ways of pursuing it cost almost nothing and are hard to attribute. That is not an accusation about intent. It is what the position itself produces. Put Britain into it. Not an invasion — I am not making that argument and neither is he. Something far more likely and far cheaper: a cable cut, a seabed sensor, an approach contested, an infrastructure failure nobody can quite attribute. The escort fleet that would have to contest that stands at eleven ships, six destroyers and five frigates, after two more were retired in July. The first replacement arrives next year, the next in 2028. Be careful with that number, because on its own it proves less than it looks like it proves. It invites a nostalgia I want no part of — Britain had around fifty escorts in 1990, and saying so establishes nothing except that the fleet was built for a different war. And a small fleet is not automatically an inadequate one. Fewer and better can be the right answer. What turns eleven into a question is concurrency, and this next part is mine rather than a published finding. The same eleven hulls have to cover carrier escort, standing alliance commitments and home approaches, and a ship in refit is not available for any of them. So the question is not whether the fleet is smaller than it was. It is whether the defensive instrument can be in enough places at once to contest the offensive one at the tempo that one actually operates. Which brings me to the part I would ask you to sit with. Standing back does not buy you quiet. On Mearsheimer’s own forecast, it buys you the frozen conflict, the departed patron, the weakened alliance and the opportunistic neighbour — all of it, exactly as described, with Britain in it and less able to do anything about it. Withdrawal is not the absence of a choice. It is a purchase, and that is what is being bought. I do not say this from a distance. I spent over a decade working in the French Alps, in kitchens and chalets and behind a wheel, and the arrangement that made that life possible is gone, and it was taken by a vote I lost. I followed that evidence somewhere uncomfortable — to the conclusion that the people who voted the other way had reasons, and that the settlement’s benefits were never as evenly spread as I wanted to believe. I am not asking you to do anything I have not done. And there is one more thing, which is the part I find hardest to get past. In Manila, three weeks ago, Elbridge Colby, the American Under Secretary of War for Policy, told allies that Washington is looking for “partners, not protectorates,” that alliances built on permanent dependency are not durable, and that countries should take responsibility for their own sovereign security. The administration promotes the doctrine under a name of its own choosing: flexible realism. I want to be precise about what that is and is not, because the whole piece collapses if I get it wrong here. Colby is not John Mearsheimer, and a serving official’s policy statement is not a scholar’s conclusion. What the Manila speech establishes is not that realism prescribes something for Britain. It establishes that the state Britain has been relying on has itself concluded that the reliance should end, and has said so out loud, under that name. Which closes the circle in an awkward place. Mearsheimer describes the environment. Washington describes what it now expects of allies within it. Neither of them tells Britain what Britain should build. That part nobody is doing, and it is the only par
