A negotiating table with civilian and military officials illustrates how external pressures can be interpreted and processed before becoming foreign policy. © CS Media.
Neoclassical Realism is an approach in International Relations that explains the foreign policy of states through the combination of external pressures and domestic filters. Like other realist currents, it begins from the idea that states operate in an anarchic international system, without a world government capable of guaranteeing their security. At the same time, it rejects the notion that the international distribution of power automatically turns into foreign-policy decisions.
For this approach, a state’s position in the international system is the starting point. That position creates pressures that may come from changes in relative power, military threats, or strategic opportunities. However, these pressures do not become foreign policy by themselves. Before that happens, they pass through leaders, institutions, and state capacities.
For this reason, Neoclassical Realism is used to answer a central question in foreign-policy studies: if two states face similar pressures, why do they react in different ways? This difference can appear in several forms. For example, one government may arm quickly in response to a threat, whereas another delays. Likewise, a rich country may take decades to act as a great power. It is also possible for one group of leaders to exaggerate an external risk while another underestimates a real danger. In all these cases, the neoclassical realist explanation lies in the interaction between the international environment and domestic politics.
Origins of Neoclassical Realism
Neoclassical Realism consolidated in the 1990s as an attempt to explain foreign policy without abandoning the realist starting point. Neorealism, associated mainly with Kenneth Waltz, had given Realism a structural formulation: to explain international patterns, one should observe the anarchy of the system and the distribution of capabilities among states.
That formulation helped explain broad phenomena, such as balance of power and competition among great powers. However, it had difficulty explaining specific foreign policies. After all, the international structure may indicate that a state is under pressure to react. It does not determine by itself, however, whether that response will come through alliances, rearmament, negotiation, or accommodation with a rival power.
The term Neoclassical Realism was consolidated by Gideon Rose in the article “Neoclassical Realism and Theories of Foreign Policy”, published in 1998. Rose identified a family of studies that preserved the weight of relative power in the international system, but incorporated domestic variables to explain how specific states formulate their foreign policy.
The name of the approach indicates this combination. It is realist because it keeps the relationship between power and security in an anarchic system at the center. At the same time, it is neoclassical because it returns to Classical Realism’s concern with leadership, prudence, and state capacity. The novelty lies in the attempt to organize these elements into a more explicit causal chain.
How the theory explains foreign policy
The central logic of Neoclassical Realism is that the international system pressures states, but foreign policy emerges when that pressure is interpreted and processed inside the state. The approach usually works with three levels of analysis:
- Systemic variables: relative power, external threats, strategic opportunities, and changes in polarity.
- Cognitive and domestic variables: leaders’ perceptions, institutions, state capacity, and internal political disputes.
- External behavior: alliances, rearmament, negotiation, accommodation, or retrenchment.
Systemic variables are the starting point because they indicate the environment in which the state must act. This environment changes incentives and constraints. For example, a country surrounded by rivals faces different problems from those of a country protected by favorable geography and powerful allies. Likewise, a state in relative decline interprets risks and opportunities differently from a rising state.
Cognitive and domestic variables are called intervening variables because they stand between external pressure and a state’s final decision. They explain the process through which an international condition is perceived, debated, and turned into action. In this process, a threat may exist in the international system, but someone still has to interpret it as a threat. Similarly, national power may exist in society, but the state must mobilize it. In addition, an external opportunity may be real, but the government needs authority and political support to take advantage of it.
This chain avoids two simplifications. The first would be to say that foreign policy comes only from outside, as if states were pieces pushed by the international structure. The second would be to say that it comes only from inside, as if parties, ideas, or social groups could explain everything without considering power and security. By rejecting both readings, Neoclassical Realism begins with the international system, but then enters the state to understand how a foreign-policy response is produced.
Most important domestic variables
Leaders’ perceptions are decisive because states do not react to power automatically. In fact, they react to power as it is understood by those who decide. This becomes clear when governments classify the same external actor in different ways. After all, a neighboring power may be seen as a military threat, a difficult partner, or a secondary problem. Depending on the classification adopted, the type of foreign policy chosen also changes.
Perception, however, may be distorted by incomplete information and ideology. Other filters, such as historical memories or bureaucratic rivalries, can also alter how the external environment is read. For this reason, neoclassical realists pay attention to miscalculation. From this perspective, a foreign-policy decision may arise not from the threat itself, but from the way leaders interpret it under pressure.
The institutional structure defines who decides, with what controls, and at what speed. This structure can formally limit foreign-policy decision-making, as happens when constitutions and parliaments restrict executive action. It can also affect implementation, since ministries, armed forces, and decision-making rules shape the government’s capacity to respond. This creates a recurring tension. A concentrated executive may act quickly, but it may also err without sufficient internal resistance. A system with many veto points may prevent external adventurism, but it may also delay necessary responses.
State capacity determines whether social resources can be converted into external power. A country may have a large population, a big economy, and natural resources, but still fail to transform those resources into international influence. For this conversion to occur, the government must raise resources, coordinate bureaucracies, and maintain instruments of foreign action. This distinction is central to Fareed Zakaria’s work, in which national wealth does not automatically equal available state power.
The relationship between state and society conditions the mobilization of human, material, and political resources. In democracies, this relationship passes through public opinion, parties, and parliamentary coalitions. In authoritarian regimes, by contrast, constraints tend to appear inside the governing bloc itself. Internal factions, military actors, or economic elites can limit external choices even when there is no open electoral competition. Therefore, in both cases, foreign policy depends on the government’s ability to obtain internal cooperation.
Strategic culture helps explain why certain options seem acceptable in one country and imprudent in another. The concept refers to habits and doctrines through which a political community interprets the use of force, diplomacy, and risk. In this way, inherited ideas and bureaucratic practices influence how governments classify threats and choose instruments. In this sense, Jeffrey Taliaferro is one of the authors associated with incorporating this type of variable into neoclassical realist analysis.
Differences from other theories
Neoclassical Realism differs from Neorealism because it does not treat the state as a “black box”. In Neorealism, the internal characteristics of states are often set aside to explain general patterns of the international system. In Neoclassical Realism, these characteristics enter the explanation because the theory aims to explain specific foreign policies.
The difference from Classical Realism lies in how the explanation is organized. Classical authors, such as Edward Carr and Hans Morgenthau, gave great importance to prudence, national interest, and leadership. Neoclassical Realism recovers part of that sensibility, but tries to make it more systematic. To do so, it formulates a more defined causal sequence: systemic pressure passes through perception, institutions, and mobilization before reaching the foreign-policy decision.
In relation to Offensive Realism, associated with John Mearsheimer, Neoclassical Realism is less inclined to state that great powers will always seek to maximize power. It may accept that the international system encourages competition. The next question, however, shifts the analysis inside the state: is there internal capacity, adequate perception, and political support to act expansively?
In relation to Liberalism, the difference is the starting point. Liberals tend to emphasize domestic preferences, political regimes, and international institutions. Neoclassical realists also observe internal factors, but they treat them as filters of international pressure. Thus, parties, elites, and institutions matter because they alter the state’s response to problems of power and security.
Finally, in relation to Constructivism, the difference lies in the role of ideas. Constructivists ask how norms and identities form interests. Neoclassical realists may accept that ideas matter, but they assign them another explanatory function. In general, they treat ideas as factors that shape perception and strategy in the face of material conditions.
Responses to external pressures
Neoclassical Realism is especially useful for explaining why states do not always respond to threats as simpler realist theory would expect. In realist terms, an external threat may encourage balancing, that is, the attempt to counter a rival through one’s own capabilities or alliances. A state practices internal balancing when it increases its military, technological, or economic resources. It practices external balancing when it seeks allies to contain a rival.
The response to a threat, however, may be insufficient. Randall Schweller is one of the authors associated with the concept of underbalancing: situations in which threatened states react less than expected. In this case, the explanation returns to domestic filters. After all, divided elites, a weak state, or a mistaken reading of the threat may prevent a proportional response.
Accommodation to the stronger power may also occur. In realist literature, the term bandwagoning describes the decision to align with the dominant or threatening power instead of resisting it. For Neoclassical Realism, this choice does not result only from external strength. It also depends on fear, dependence, calculations of survival, or expectations of benefit.
The opposite movement also matters: a response that is too strong for the existing threat. In that case, the state may spend more resources than necessary or provoke adversaries. In more serious situations, it may create coalitions against itself or enter avoidable conflicts. These deviations show the role of the approach. It explains different responses without setting aside the weight of the international system, because external pressure matters, but its effects depend on how each state perceives the threat, mobilizes resources, and decides.
Examples of application
The most useful examples for Neoclassical Realism are those in which similar external pressures produced different responses. A frequent case is the rise of the United States in the late nineteenth century. In economic terms, the country already had great potential. Even so, its more ambitious international role came gradually. The neoclassical realist reading uses this lag to show that national wealth was not enough. To produce a more active foreign policy, that wealth had to be converted into state capacity and political instruments.
Another example appears in the comparison between China and Japan in the nineteenth century. Both faced pressures from Western powers, but responded differently. In this case, the difference passed through the capacity for internal reorganization. During the Meiji era, Japan carried out deep political, military, and administrative reforms. In China, the Qing dynasty faced greater difficulties in reorganizing its state. Therefore, external pressure existed in both cases, but internal capacities produced distinct responses.
The Cold War can also be analyzed through this lens. The United States and the Soviet Union did not react only to objective indicators of power. Between those indicators and political decision stood interpretations by leaders. For this reason, the assessment that the adversary was advancing or exploiting a window of opportunity could alter decisions about armaments, alliances, and regional crises.
In the Brazilian case, the approach can help interpret moments of greater diplomatic autonomy. One example is the so-called Responsible Pragmatism, an expression associated with the foreign policy of the Ernesto Geisel government during Brazil’s military dictatorship in the 1970s. The external context favored some room for maneuver, since there was détente among the great powers and change in the Brazilian economy. The Brazilian response, however, also depended on internal factors: centralized decision-making under the military regime and the perception that the country could diversify partnerships. Thus, the resulting foreign policy emerged from this combination of international environment and domestic calculation.
Contributions and limits
The main contribution of Neoclassical Realism is to explain why states in similar international positions do not always adopt similar foreign policies. This difference appears because threats may be perceived differently, institutions function in different ways, and resources are mobilized to unequal degrees. The approach allows these differences to be observed without reducing foreign policy to isolated domestic preferences.
In addition, the theory helps examine when the response occurs. Timing matters because a state may recognize a threat too late, take too long to form alliances, or fail to finance rearmament. In foreign policy, therefore, delay, speed, and sequence can be as important as the general direction of the decision.
Another contribution is to bring IR theory and historical analysis closer together. Neoclassical Realism works well with case studies because it requires reconstructing the sequence between external pressure and state decision-making. This reconstruction makes it possible to observe leaders and bureaucracies in action. It also helps situate internal debates, available resources, and social constraints.
The most common limit, however, is excessive flexibility. Since the approach allows many domestic variables to be included, there is a risk of explaining each case only after the outcome is known. The problem appears when the analysis chooses only the factors that seem convenient. To avoid this, a neoclassical realist explanation must state from the beginning which systemic pressure matters and which internal variables should be observed.
Another limit is the loss of simplicity. Neorealism is more parsimonious because it observes mainly the international structure. By including domestic variables, Neoclassical Realism explains more details, but becomes less elegant and harder to test. In short, its strength is depth; its cost is complexity.
Conclusion
Neoclassical Realism shows that power matters in International Relations, but it does not act alone. The distribution of capabilities creates pressures on states, as do external threats and opportunities. These pressures become foreign policy only after passing through perceptions, institutions, and internal capacities.
For this reason, the approach is useful for studying concrete decisions. It helps explain why countries sometimes react late, overreact, or accommodate dominant power. It also explains why apparently available resources may remain unused. Its central argument is that foreign policy begins in the international system, but is produced inside the state.