The tentative peace deal between the United States and Iran has already triggered a familiar debate: To some, it is definitive proof of American strength; to others, it is a glaring strategic failure.
After nearly four months of war — marked by the death of Iranian Supreme Leader Ali Khamenei, the systematic destruction of Iran’s military infrastructure, a punishing naval blockade, and a massive shock to the global economy — the two adversaries are suddenly poised not for escalation, but for formal peace.
US President Donald Trump has announced that a memorandum of understanding has been signed in principle, with talks set to continue in Geneva this Friday.
The immediate question is obvious: Who won?
The more interesting question, perhaps, is why we keep asking it.
For most of recorded history, military victory and political victory were closely linked. Armies fought, one side prevailed, terms were imposed, and the defeated accepted the outcome because they had little choice.
The model reached its most dramatic expression in World War II. Germany surrendered unconditionally. Japan surrendered unconditionally.
The victorious powers dictated the postwar order. No negotiations took place between equals. There was no ambiguity regarding who had won and who had lost.
Many strategic thinkers continue to view war through this historical lens. Military superiority, they assume, should ultimately produce political submission.
Yet the decades since 1945 tell a different story.
The Korean War ended not with surrender but with an armistice. The Vietnam War ended not with political victory for the United States but with withdrawal.
The war in Afghanistan demonstrated that battlefield dominance does not necessarily translate into a durable political outcome. Russia’s invasion of Ukraine has become a protracted struggle of attrition rather than the rapid conquest initially envisioned by Moscow.
Now Iran, despite suffering devastating military losses, appears to have achieved the one objective that mattered most to its leadership: survival.
These conflicts differ enormously in ideology, geography, and scale. What unites them is that none ended in the manner of World War II.
The reason lies partly in the changing incentives of modern warfare.
In 1945, Japan faced an adversary willing and able to wage total war. American cities were beyond Japanese reach. The United States enjoyed overwhelming industrial superiority.
The American public had accepted extraordinary sacrifice. The moral and legal constraints governing warfare were far weaker than they are today.
Firebombing cities and imposing massive civilian casualties, however controversial even then, remained accepted instruments of war.
The postwar world gradually changed those assumptions.
International law expanded. Global media exposed battlefield realities in real time. Economic interdependence deepened.
Democracies became increasingly sensitive to casualties, inflation, and prolonged conflict. Military power remained immense, but the acceptable uses of that power narrowed.
A modern great power often possesses the ability to inflict far greater destruction than it is politically willing to employ.
At the same time, a technological revolution has transformed the economics of war.
For most of modern history, military effectiveness was closely tied to industrial output. Wealthier states could build more ships, aircraft, tanks, and artillery than their adversaries.
Scale was decisive.
Today, the spread of precision-guided weapons, commercial technologies, satellite networks, and inexpensive drones has altered that equation. A drone costing a few thousand dollars can threaten a system worth millions.
Swarms of expendable weapons can force defenders to launch interceptors costing hundreds of thousands, or even millions, of dollars apiece. Commercial satellite imagery and communications can provide capabilities once reserved for major powers.
The significance of these technologies is not that they eliminate military superiority. They do not.
Their significance is that they dramatically reduce the cost of imposing pain. A weaker state may still be unable to defeat a great power outright, but it can make victory slower, costlier, and politically more difficult to sustain.
This shift has strengthened the strategic logic of asymmetric warfare. Military power has become less efficient at translating battlefield dominance into political outcomes.
For a weaker state, survival itself has become a viable form of victory. Tehran did not need to conquer territory. It did not need to defeat the United States.
It merely needed to impose sufficient economic, diplomatic, and strategic costs to prevent Washington from translating military success into unconditional political submission.
This points to another asymmetry that increasingly defines modern conflict.
The weaker side is often fighting for one thing.
The stronger side is usually fighting for several.
The United States was not merely fighting Iran. It was fighting a domestic political battle, managing rising energy prices, navigating international criticism, maintaining coalition support, and weighing the electoral consequences of a prolonged conflict.
Tehran, by contrast, faced a far simpler calculation: Survive.
This creates a paradox. The stronger power frequently possesses greater military freedom but less political freedom.
Its adversary may be weaker, poorer, and more vulnerable. Yet because its objectives are narrower, it may be able to absorb levels of pain that the stronger power finds politically unsustainable.
This does not mean military power has become irrelevant. What has changed is the relationship between military success and political outcomes.
The age of total war produced clear endings. The age that followed has produced armistices, negotiated settlements, frozen conflicts, and strategic stalemates.
The question is no longer whether a great power can destroy its adversary. In many cases, it plainly can.
The question is whether it is willing to pay the political, economic, legal, and moral costs required to force unconditional surrender.
Increasingly, the answer appears to be no.
This may be the most important geopolitical shift of the post-1945 era.
For centuries, victory meant compelling the enemy to accept your terms. Today, victory increasingly ends at the negotiating table, where each side walks away with something it can claim as success.
The age of unconditional surrender has given way to the age of strategic survival. The defeated still survive, the victors still compromise, and both return home claiming victory.
What was once decided on the battlefield is now often settled in the realm of narrative.
That distinction may sound subtle. It is not.
One belongs to the age of unconditional surrender.
The other belongs to the age we live in now.
John Cheng is a retired businessman from Hong Kong who lives in Taiwan and is the author of “Taiwan Is Taiwan.”
