Realist Power Analysis

The Inconvenient Persistence of Geography

Analysts who came of age in the years when the space domain was described as a shared commons expected cooperation to deepen. Multilateral treaties existed. Scientific collaboration flourished. The rhetoric of peaceful uses had become a stable default in diplomatic discourse. The domain had never seen kinetic conflict, and every reasonable actor had interests in keeping it that way.

And yet, a generation later, the space domain has militarised in ways that were considered impolite to discuss twenty years ago. Counterspace capabilities have proliferated. Orbital regimes have become objects of strategic positioning rather than neutral terrain. The rhetoric of peaceful uses has not disappeared, but it is now routinely paired with explicit national-security language that earlier analysts would have found jarring. The domain is not at war. It has, however, become contested in ways that benign-commons frameworks cannot explain.

Realist power analysis is the framework that predicted this drift. Its claim is structural: in any domain where material capabilities confer advantage, where no overarching authority can enforce cooperation, and where actors cannot verify each other’s intentions, competition will emerge. The claim holds whether or not any particular actor wishes it would not hold. For analysts of space policy who find themselves persistently surprised by the militarisation of the domain, realism is the instrument that explains why surprise was the wrong reaction.

From Thucydides to the Orbital Rimland

The lineage is old and deliberately so. Realism draws its first vocabulary from Thucydides, whose account of the Peloponnesian War established that states act under the pressure of their relative power and that the weaker must often yield what the stronger will take. Machiavelli, in the sixteenth century, extended the argument into a theory of statecraft in which prudence consists of reading power relations accurately rather than moralising about them. Hans Morgenthau, writing in the 1940s in the aftermath of cataclysmic European conflict, produced the classical realist synthesis: states pursue interests defined in terms of power, operating under anarchy, and morality must accommodate itself to this reality rather than presume to override it.

Kenneth Waltz, in 1979, reconstructed realism as a structural theory. States behave as they do, Waltz argued, not because of their regimes or leaders but because of the structure of the international system — the anarchy that forces self-help, the distribution of capabilities that shapes alignment, the polarity that conditions stability. Waltz gave the field its levels-of-analysis discipline: system, state, and individual levels each produce distinct findings, and rigorous analysis requires reading all three. John Mearsheimer, from the 1990s onward, developed an offensive-realist variant arguing that states not only seek security but actively pursue regional hegemony, producing a more conflictual reading of great-power competition than Waltz’s defensive formulation.

Alongside this theoretical lineage runs a parallel one from classical geopolitics, whose propositions realists draw on without quite absorbing. Halford Mackinder, in 1904, argued that control of the Eurasian interior — the Heartland — was the key to world power, a thesis condensed into his famous dictum about who rules the Heartland commanding the World-Island. Alfred Thayer Mahan, writing earlier in 1890, made the sea-power case: naval supremacy and control of the sea lanes are the foundation of national strength, and the six elements he identified — geographic position, physical conformation, territorial extent, population, national character, and governmental character — are the determinants of sea-power potential. Nicholas Spykman, in 1942, offered the Rimland corrective: the coastal belt around Eurasia, not its interior, is the decisive zone, and amphibious flexibility outweighs continental depth.

Each of these classical theories was developed for a specific terrestrial geography. Their application to space requires analogical reasoning, not mechanical translation, and the quality of an analysis often depends on the care with which the analogy is drawn. Mackinder’s Heartland is not a satellite orbit. But the idea that certain geographic positions confer structural advantage, and that spatial relationships shape long-term power dynamics, survives the translation if handled carefully.

The Characteristic Move

What realist power analysis does, and what liberal or constructivist readings do not, is place the distribution of material capabilities at the centre of explanation. The method’s first discipline is to identify the actors and rank them not by what they say but by what they can do — launch cadence, on-orbit assets, ground infrastructure, industrial base, dual-use capabilities, technological depth. The material inventory is the foundation. Analysts who begin with rhetoric and never descend to capability produce readings that consistently mispredict behaviour.

The second move is the security dilemma. A state that builds defensive capability to protect its assets is read by other states through the filter of anarchy, which forbids certainty about intentions. A reconnaissance satellite designed to improve transparency is, to an adversary, a targeting asset. A rendezvous-and-proximity-operations capability developed for on-orbit servicing is, to an adversary, a potential anti-satellite system. The security dilemma is not a misunderstanding that better communication would resolve; it is a structural feature of a domain in which intentions cannot be verified. Realist analysis traces the action-reaction cycles the dilemma generates and identifies the technologies whose development is most likely to be misread.

The third move is deterrence architecture. Given the material balance and the security-dilemma pressures, what can each actor credibly threaten, and what threats would each believe? Deterrence depends on capability, credibility, and communication, and space presents distinctive challenges in each. Capabilities can be ambiguous, credibility can be undermined by the reversibility of counterspace effects, and communication can be degraded by the absence of established signalling conventions. A realist deterrence reading identifies where the architecture is stable and where it is fragile — the red lines that hold and the ones that do not.

The fourth move is alliance dynamics. States do not face anarchy alone; they balance against threats through alliance formation or bandwagon with rising powers. The pattern of alignment — who balances whom, with what cohesion, under what free-rider pressures — is a realist indicator that frequently outperforms rhetorical analysis. In space, the formation of distinct alignment blocs around alternative cooperative frameworks is legible as balancing behaviour even when participants describe their motives in cooperative terms.

The final move is the theoretical convergence check. Mackinder, Mahan, Spykman, and Waltz emphasise different features of the landscape, and where they converge, the finding is robust; where they diverge, the divergence is itself analytically valuable. An analyst whose reading produces agreement across the classical theories has identified a structural feature that is likely to hold across time; an analyst whose reading depends on only one lens has produced a more fragile conclusion.

What distinguishes realist analysis from neighbouring methods is this layered material-structural discipline. Stakeholder mapping identifies actors without weighting capabilities; constructivist analysis privileges norms over material facts; liberal institutionalism emphasises cooperative mechanisms over structural pressures. Realism’s contribution is the bedrock — the distribution of power and the geographic and structural features that condition every other dimension of analysis.

The Method at Work: Competition Over a Cislunar Corridor

Consider two states engaged in sustained competition for influence in the cislunar region. State A has developed superior launch cadence, operates a functioning lunar-relay communications network, and has established credible precision-manoeuvring capability in the region. State B has greater financial resources, a larger constellation in broader cislunar orbits, and a growing but less mature relay capability. Both describe their activity in cooperative scientific terms. Both are increasing their investment year on year.

The realist capability map flags immediate asymmetries. State A’s advantage is operational and positional: the relay network gives it structural influence over information flows in the region, a capability whose value compounds as activity increases. State B’s advantage is resource-based and catches up slowly; financial depth converts into capability only with a lag measured in years. At the time horizon of the analysis, neither actor can displace the other, and both will remain in the region.

Applying Mahan, the cislunar corridor functions as a line of communication. It is the transit path on which both actors depend, and the relay network gives State A something close to chokepoint-like informational control. This is not the same as military blockade — the physical chokepoints of naval theory do not translate directly — but the structural logic holds: whoever controls the information infrastructure around a transit corridor has disproportionate influence over what happens in it.

Applying Mackinder loosely, the lunar surface plays the role of a resource Heartland whose long-term value is structural rather than immediate. Control of surface positions, particularly in polar regions where sustained solar illumination and water ice are concentrated, confers advantages that compound over decades. Neither actor yet holds meaningful surface positions; both are investing as if they expected to.

Applying Waltz at the system level, the structure is bipolar in the cislunar domain, with the familiar properties of bipolarity — some stability from mutual recognition of core interests, but also heightened security-dilemma pressure because every capability gain by one is read as positioning by the other. At the state level, both actors display strategic cultures that frame scientific exploration in partly nationalist terms, which reinforces the competitive dynamic. At the individual level, no leader’s agency appears decisive over the structural pressures; the analysis does not depend on the specific personalities involved.

The security-dilemma read sharpens. State B’s expansion, repeatedly described as scientific, appears to State A as positioning for contested Lagrange points that would, over time, allow it to establish relay competition and erode State A’s informational advantage. State B’s rhetoric is sincere in its cooperative framing and also consistent with capability accumulation that State A would rationally treat as threatening. Neither state needs to be acting in bad faith for the dilemma to operate; the structure produces the dynamic regardless of intent.

Deterrence credibility is fragile. Each actor possesses counterspace options that could degrade the other’s assets, but the reversibility and attribution difficulty of many such options weaken their deterrent value. Red lines are unclear; no established signalling convention exists for cislunar behaviour. The risk of miscalculation is a structural feature of the competition, not a transient irritant.

The theoretical convergence check holds. Mahan, Mackinder, and Waltz all point to the same finding: the cislunar corridor is a strategically consequential line of communication with resource-bearing terminuses, and competition for it is structurally conditioned regardless of either actor’s rhetoric. The analytical insight the method produces is not “competition exists” — any newspaper would say as much — but that the structural features of the corridor make competition likely to persist and deepen even if both actors were to genuinely prefer cooperation. That is a finding that rhetorical or diplomatic analysis alone cannot deliver.

Where It Holds, Where It Limps

Realist power analysis holds where material capabilities, geographic position, and structural pressures are decisive. For great-power competition in contested domains, for assessments of deterrence stability, for alliance-formation dynamics, and for understanding why cooperative rhetoric coexists with competitive behaviour, it is the instrument of first resort.

Its weaknesses are equally precise.

A Note for the Practitioner