In teaching foreign policy at the university level, one principle recurs with striking consistency: power, by itself, is not strategy. States endure not merely because of their military or economic weight, but because of their ability to convert power into legitimacy, predictability, and influence through diplomacy. When power is detached from restraint, persuasion, and institutional cooperation, it ceases to be strategic and becomes destabilising.
It is against this analytical backdrop that the foreign policy record of the Trump administration appears less unconventional than fundamentally discordant with established principles of statecraft.
Foreign policy, as taught in both theory and practice, is a disciplined enterprise. It aligns national interests with long-term objectives, balances values with capabilities, and relies on diplomacy as the primary mechanism through which power is rendered acceptable and sustainable. From 2017 to 2021, however, the United States pursued an approach that often treated diplomacy not as a strategic craft, but as an arena for performance, coercion, and disruption.
From Grand Strategy to Public Confrontation
Trump’s foreign policy posture consistently favoured confrontation over consultation. Allies were publicly rebuked, multilateral institutions disparaged, and long-standing agreements abandoned with little strategic replacement. NATO partners were threatened with withdrawal, trade allies were labelled adversaries, and international commitments were framed as liabilities rather than assets.
In foreign policy theory, alliances are not acts of charity; they are force multipliers. They extend influence, distribute costs, and enhance legitimacy. Undermining them through public intimidation violates a foundational lesson of great power diplomacy: trust is a strategic resource. Once eroded, it cannot be easily restored.
Coercion Without Credibility
A central theme in my lectures is the distinction between coercive capacity and credible leadership. The Trump administration leaned heavily on the former while steadily weakening the latter. Tariffs replaced negotiation. Threats substituted for persuasion. Social media announcements eclipsed institutional channels.
Yet coercion without credibility often produces resistance rather than compliance. Instead of compelling alignment, it encourages hedging and diversification. During this period, U.S. allies increasingly explored alternative partnerships and strengthened regional autonomy—not necessarily out of hostility toward Washington, but out of uncertainty about its reliability.
Selective Morality and Authoritarian Indulgence
Equally consequential was the administration’s normative incoherence. Democratic allies were frequently chastised, while authoritarian leaders were praised or indulged. Public admiration for Vladimir Putin, leniency toward authoritarian partners, and headline-driven summits with Kim Jong-un conveyed a message that values were negotiable and norms expendable.
Foreign policy scholarship has long recognised that influence flows not only from material power but from normative leadership. When a hegemon abandons this role, it creates a vacuum. Trump’s tenure coincided with growing authoritarian confidence, weakened democratic norms, and increased strain on global governance institutions.
Diplomacy as Spectacle
Perhaps the most enduring departure from orthodox statecraft was the reduction of diplomacy to spectacle. High-profile meetings generated attention but few durable outcomes. Withdrawals from the Paris Climate Agreement, the Iran nuclear deal, and other multilateral frameworks were executed with rhetorical flourish but minimal strategic continuity.
In the classroom, students learn that effective foreign policy is incremental, institutional, and often unglamorous. It values process precisely because process sustains outcomes. The Trump administration inverted this logic, privileging visibility over viability.
The Strategic Cost
Defenders of Trump’s foreign policy argue that disruption was deliberate—that unpredictability kept adversaries off balance. But unpredictability only works when embedded within a coherent strategy. What emerged instead was reactive decision-making, inconsistent signalling, and diminished confidence in U.S. commitments.
The costs were tangible. Alliances weakened. Soft power eroded. Multilateralism faltered. The United States came to be seen less as a dependable leader and more as an unreliable actor. These are not abstract losses; they shape how states assess risk, form alliances, and respond to crises.
A Cautionary Lesson
If foreign policy is the projection of national purpose into the international system, then the Trump years offer a cautionary lesson. They illustrate how rapidly diplomatic capital can be squandered when power is exercised without prudence, and how leadership erodes when coercion replaces credibility.
As I remind students, great powers often decline not solely because of external challengers, but because of internal misjudgment. Trump’s foreign policy legacy is therefore not just an indictment of one administration, but a warning about what happens when diplomacy is dismissed as weakness and institutions are treated as obstacles rather than assets.
In an increasingly fragmented and competitive world, disciplined, principled, and institutionally grounded foreign policy is not optional. It is the difference between influence that endures and power that exhausts itself.