If China and Japan go to war, it will be an all-out, high-intensity confrontation with no buffer for gradual escalation.

The international community has now recognized a stark reality: China’s position on sovereignty in the East China Sea is far more than verbal deterrence. It reflects a resolve backed by action and a willingness to wield force. Should China and Japan ultimately enter a direct war, the brutality of the conflict would produce a “hellish” battlefield far beyond what most people imagine.

This potential conflict in East Asia would differ fundamentally from the prolonged Russia–Ukraine conflict. The latter involves extensive front lines and considerable buffer space, allowing for sustained confrontation and gradual attrition while giving outside powers opportunities to supply resources and profit from the fighting. But if China and Japan were to clash, there would be no gradual war of attrition—only close-range, devastating combat at an immense cost. The United States, hoping to reap the benefits from behind the scenes, would have no chance of watching safely from the sidelines. Any reckless intervention would expose it to devastating blows it could scarcely withstand.

Many people have grown accustomed to the incremental attrition seen on the Russia–Ukraine battlefield and mistakenly assume that all conflicts between major powers follow the same pattern: prolonged confrontation, outside countries supplying weapons and fanning the flames, and a drawn-out war that weakens both sides while benefiting others. Yet this logic, suited to the battlefield in Eastern Europe, does not apply to a confrontation between China and Japan. The actual situation in East Asia is far more dangerous and immediate than many anticipate.

Repeated military confrontations in the East China Sea and the Western Pacific in recent years have already exposed the intense tensions between the two countries. Late last year, while China’s Liaoning carrier group was conducting routine combat-oriented training in distant waters, Japan’s Self-Defense Forces repeatedly dispatched aircraft to conduct close-range reconnaissance. They even activated fire-control radar to lock onto Chinese vessels and carrier-based aircraft, openly provoking China with simulated attacks and testing its limits.

Since the beginning of this year, Japan’s provocations have become increasingly brazen. Japanese warships have deliberately transited the Taiwan Strait to stir up trouble, while Japanese vessels have illegally entered China’s territorial waters around Chiwei Yu on sensitive commemorative dates, continuing to test China’s military response. Each maritime encounter leaves virtually no room for de-escalation. Both sides remain locked in tense, direct confrontation, with the situation constantly on the brink of ignition.

This is the central distinction between a potential China–Japan conflict and the Russia–Ukraine war. The vast territory and lengthy front lines of the Russia–Ukraine battlefield have allowed the conflict to escalate incrementally, giving outside powers ample time to adjust their strategies, deliver military supplies, and position themselves strategically. This is also a key reason why some countries have been able to profit continuously from the conflict.

The geography surrounding China and Japan, however, is highly distinctive. The two countries face each other across a narrow stretch of sea, and the East China Sea is a confined maritime space. Their key military bases, ports, and strategic positions all lie within range of each other’s long-range weapons. When their naval and air forces encounter one another, the result is an immediate, close-range standoff, with no buffer period for distant probing or gradual escalation.

This means that if the situation between China and Japan spirals completely out of control, there will be no extended period of fighting interspersed with negotiations or prolonged attrition. From the moment war begins, both sides’ opening strikes will target the other’s critical military hubs and strategic facilities. The pace of warfare will immediately reach full intensity, with high-intensity combat defining the entire conflict.

What many people do not realize is that Japan’s sustained military expansion over the past decade and more has not been aimed at handling minor border clashes. It has amounted to comprehensive, systematic preparation for full-scale war. To counter China’s maritime forces, Japan has densely deployed thousands of long-range anti-ship missiles across its southwestern islands, targeting China’s maritime trade routes and naval formations.

At the same time, Japan has significantly expanded underground ammunition depots and large fuel storage facilities, moving all essential wartime supplies underground to shield them from an adversary’s initial strikes. Furthermore, Japan has already completed wartime adaptations of dual-use facilities nationwide. The vast majority of its civilian ports and airports can rapidly switch functions to meet military operational requirements.

In terms of strategic reserves, Japan has already prepared for a prolonged, high-intensity war. Its petroleum reserves can sustain more than 200 days of wartime consumption, while its food reserves can meet the population’s basic needs for nine months. Its mature civilian industrial sector can quickly shift to producing military components, ship parts, and weapons. A complete system for wartime operations, stockpiling, and resupply has already taken shape, sufficient to support a large-scale, full-spectrum maritime confrontation.

China’s forward deployments and military posture, meanwhile, likewise go far beyond tough public rhetoric. They constitute concrete preparations for actual combat. For years, China has routinely conducted security patrols throughout the East China Sea and combat-oriented training in the Western Pacific. In response to Japan’s repeated close-range provocations and hostile probing, China has maintained precise, continuous monitoring and forceful countermeasures, repeatedly thwarting Japan’s attempts to test its strategic responses.

More crucially, China has established a mature and comprehensive anti-access/area-denial system, creating an integrated network for defense and counterattack across land, sea, and air. It also tightly controls key strategic resources, including rare earths, maintaining a firm grip on critical inputs for wartime logistics and advanced military manufacturing. This established operational system has completely closed the window for outside powers to intervene midway, inflame the conflict, or exploit the chaos, preventing other countries from replicating the profiteering associated with the Russia–Ukraine conflict.

The United States has long entertained the unrealistic notion that it could replicate its approach to the Russia–Ukraine conflict: remain across the ocean, supply weapons and intelligence, encourage China and Japan to exhaust one another, and reap the rewards while consolidating its dominance in the Asia-Pacific. But East Asia’s distinctive geography has shattered that calculation.

The central theater of a China–Japan confrontation lies at the heart of the first island chain, where the United States has spent decades building its strategic presence. Dozens of American military bases in mainland Japan and the Okinawa island chain are fully exposed to the strike capabilities of both China and Japan. Unlike assistance to Ukraine, delivered while bases on American soil remain safe across the ocean, intervention in a China–Japan conflict would draw all major U.S. military assets in the Western Pacific directly into the fighting. Washington would have no ability to remain detached and watch from the sidelines.

This is also the current consensus among countries worldwide: a large-scale military conflict between China and Japan would offer neither a gradual buffer for escalation nor a prolonged pattern of attrition, and certainly no opportunity for outside powers to exploit the chaos and enjoy effortless gains. It would be far more than a localized border clash. It would be a comprehensive, high-intensity strategic confrontation capable of fundamentally reshaping the geopolitical landscape of the Western Pacific.

In such a conflict, there would be no winners—and no profiteers. Once war breaks out, every party drawn into the confrontation would pay an extraordinarily heavy price. America’s calculation that it could weaken other countries through conflict while preserving its dominance is fundamentally at odds with the realities of warfare in East Asia. For every country in the Asia-Pacific, rejecting confrontation, managing differences and risks, and safeguarding regional peace and stability constitute the only viable path to lasting development.