OPEN LETTER: To Koizumi and Ahn — The Seoul Visit That Changes the Geography of Resistance

Introduction: a letter to two ministers who made the right call

The gesture of June 28, 2026

Ministers Shinjiro Koizumi and Ahn Gyu-back, I am writing to you from the other side of the world, from a desk where I follow global security developments with the attention of a columnist who has learned to read diplomatic gestures as closely as official statements. On June 28, 2026, you met in Seoul — and that fact, which might seem ordinary, is anything but. It was the first bilateral visit by a Japanese defense chief to South Korea in 11 years. Eleven years. A generation of diplomatic inertia, erased by a handshake.

This letter is not a call for you to do more than you are already doing. It is an acknowledgment of what you accomplished on June 28, and an attempt to place that moment within the broader context that gives it meaning. Because your meeting is not merely a matter between Tokyo and Seoul. It sends a signal to Beijing, Pyongyang, Moscow, and Washington. And that signal deserves to be read aloud.

What I took from the official communiqué

According to Reuters, you jointly reaffirmed your commitment to the denuclearization of the Korean Peninsula. You agreed to resume joint maritime search-and-rescue exercises. You arranged exchanges between your aerobatic teams — the South Korean Black Eagles and the Japanese Blue Impulse. And you announced, according to other sources, cooperation on artificial intelligence, unmanned systems, and annual trilateral exercises with the United States. This is more than a situational agenda. It is the reconstruction of an architecture of trust between two nations that history has long kept apart.

What brought you together: the bombers of June 27

Nine aircraft in two air defense identification zones

Minister Koizumi, you described the previous day's operations as a "targeted demonstration of force against Japan." Let me be precise about what happened. On June 27, 2026, Russia and China conducted joint bomber patrols for the first time that year. Two Chinese H-6 bombers joined two Russian Tu-95 bombers and two Tu-142 maritime patrol aircraft, accompanied by Chinese J-16 fighters and a Russian Su-35. Nine aircraft in total. They penetrated the KADIZ — the Korean Air Defense Identification Zone. Ten aircraft, in a different configuration, penetrated the Japanese JADIZ.

South Korea summoned Chinese and Russian military attachés to protest. Japan's air force scrambled its fighters. Those responses were appropriate. But what was most eloquent is what happened the next day: you met. The threat had supplied the urgency that years of diplomacy had not created. Sometimes history forces the right decisions through pressure rather than vision. The result is what counts.

What these joint flights truly signal

These Russia-China joint patrols are not military curiosities. They are the physical demonstration of strategic coordination between two powers that, each in its own way, seek to redefine the security order in East Asia and beyond. The Russia that sends Tu-95 bombers and fighters into the KADIZ is the same Russia that fires missiles at maternity wards in Ukraine. The China that participates in these patrols is the same China that controls civilian vessels east of Taiwan. These events are not separate — they are the regional expressions of a single strategy of defiance against the liberal Western order.

The weight of eleven years of absence

The history that complicates the geography

Ministers, I need to say a few words about the eleven years preceding your meeting, because they explain why it matters so much. South Korea and Japan share democratic values, intertwined economic interests, and a geography that makes them inescapable neighbors. But Japan's colonial history in Korea (1910–1945), the unresolved disputes over compensation for forced laborers and comfort women, and the territorial dispute over the Dokdo/Takeshima islands — all of this has maintained a diplomatic distance from which your common adversaries have profited handsomely.

North Korea benefited from that distance by developing its nuclear program without having to face a united alliance. China benefited by maintaining separate channels with Tokyo and Seoul. Russia benefited knowing its regional partners could count on fragmentation among its adversaries. Your June 28 meeting is a response to that fragmentation — belated, perhaps, but real.

The progress of 2025 as a foundation

Your meeting did not come out of nowhere. According to Reuters, in 2025, Japan and South Korea had already agreed to closer security and economic ties. You had committed to working with Washington against North Korea's nuclear threat and Pyongyang's growing military links with Russia. There had been announced cooperation on AI and unmanned systems. Those foundations existed. What June 28, 2026 did was make them visible — to give a physical body, a handshake, a press conference, to what had remained commitments on paper.

North Korea: the common enemy that cements the alliance

Pyongyang-Moscow: an axis that should unite you

Ministers, I want to speak to you about North Korea, because it may be the most direct factor making your alliance urgent. Pyongyang is sending soldiers to die in Russia — thousands of them, trained, armed, and deployed in the Donbas trenches. In return, Kim Jong-un is receiving military technology, fuel, and diplomatic cover from Russia. And at the plenum of June 20–22, 2026, he declared that North Korea is now an "irreversible nuclear state" called to "exercise its standing." That is a statement of doctrine, not rhetoric.

This evolution is directly relevant to your collective security. A Kim Jong-un emboldened by his partnership with Putin, technologically reinforced by Russo-Korean military exchanges, and declaring his nuclear irreversibility — that is a threat that simultaneously and directly affects Tokyo and Seoul. Your cooperation on AI and defense systems announced on June 28 must be understood in this context. This is not routine cooperation. It is a response to a combined threat that is accelerating.

North Korean soldiers as a strategic signal

The deployment of North Korean soldiers to Ukraine is not merely a geopolitical curiosity. It is a real-time technology transfer: Pyongyang's soldiers are learning to fight in a war of drones, precision artillery, and electronic countermeasure systems. Those lessons will return to North Korea with them. Kim Jong-un's army will be different in ten years from what it is today — more capable, better equipped, more battle-hardened — in part thanks to the know-how acquired in the Russian trenches. This is a long-term risk for your region that is rarely named as clearly in Western capitals.

The Ukraine-Asia connection: one war, two theaters

What Ukrainian resistance demonstrates for East Asia

Ministers, I imagine you follow the war in Ukraine closely. Not out of abstract curiosity — but because the lessons being played out there apply directly to your own security scenarios. Ukraine demonstrates that a democracy's resistance to invasion is possible, costly for the aggressor, and dependent on an ecosystem of international support. It also demonstrates that prior preparation — doctrines, exercises, stockpiles, alliances — is decisive in the first hours and days.

Those lessons resonate directly for Taiwan, South Korea, and Japan. They say: build your alliances before the crisis, not during. Exercise your procedures before the emergency. Share your technologies before adversarial superiority makes exchanges impossible. Your June 28 meeting is a response to that lesson. It comes four years after Ukraine learned at first-hand what unpreparedness costs — a lesson you appear to have heard.

The Indo-Pacific security architecture: a work in progress

The Seoul-Tokyo coordination fits within a broader Indo-Pacific security architecture that has been taking shape in recent years: the Quad dialogue (United States, Japan, India, Australia), the AUKUS agreement (Australia, United Kingdom, United States), the reinforced US-Japan partnership, the growing ties between the Philippines and Washington. Within that framework, the Seoul-Tokyo relationship was the weak link — two of the world's most advanced democracies with significant military capabilities, yet structurally separated by history. Your meeting repairs that link.

What you announced: a concrete reading

AI and unmanned systems: the future of defense

The announced cooperation on artificial intelligence and unmanned systems deserves particular attention. This is not a vague promise. In the context of the war in Ukraine, where drones have irreversibly transformed military tactics, a cooperation agreement on these technologies between two of East Asia's most advanced nations carries real strategic weight. Japan possesses an exceptional precision industrial base. South Korea is a global leader in electronics and embedded systems. Together, you can produce capabilities that neither could develop as quickly alone.

Coordination on unmanned systems, in an environment where North Korea regularly sends drones into South Korean territory and China monitors the Taiwan Strait with growing capabilities, is a concrete defense priority. This is not abstract doctrine — it is technology applied to documented, immediate threats.

Joint exercises: rebuilding muscular trust

The announced maritime search-and-rescue exercises may seem modest compared to the scale of the threats described. But military trust is built through exercises, not just treaties. Every joint maneuver creates shared protocols, common radio frequencies, mutual identification procedures. These technical elements — invisible in press releases — are what allows two armies to work together when minutes count. The Blue Impulse and Black Eagles flying together do more than spectacle: they create interoperability. And interoperability saves lives.

The message to China: what you said without saying it

Beijing understood the message

Minister Koizumi, Minister Ahn, your June 28 meeting was not officially directed at China. But Beijing understood the message without needing it explained. A reinforced Seoul-Tokyo alliance, coordinated with Washington through trilateral exercises, equipped with shared AI and drone capabilities, complicates Chinese military calculations in the region. If China ever decides to act against Taiwan, it now must factor in the possibility of a coordinated response from three regional powers instead of two. That third power — South Korea — changes the equation.

I want to be honest about this: I do not know whether your June 28 agreement will influence Xi Jinping's calculations regarding Taiwan. The variables are too numerous, the interests too complex for such certainty. But I know that deterrence functions through accumulation — every additional alliance, every shared capability, every joint exercise adds to the perceived cost of aggression. Your meeting is one more stone in that edifice of deterrence.

What you are not saying about China

There is an economic reality that official diplomacy does not name directly: both South Korea and Japan are heavily dependent on their trade with China. Explicitly naming Beijing as a threat carries real economic risks that your governments must weigh. This constraint is not cowardice — it is prudence in an environment where security and economic interests are in tension. I understand it. But I want to name what official communiqués do not say: your June 28 cooperation also responds, implicitly, to the rise of Chinese military power in your region.

The role of Washington: what you can expect and what you cannot

Trump as an unpredictable partner

Ministers, I must speak to you about Washington. The Trump administration is a security partner that offers formidable formal guarantees — bilateral treaties, the presence of American forces in South Korea and Japan, the Article 5 NATO commitments for Japan — but whose political behavior day to day remains unpredictable. Trump has an instinct for the direct balance of power that can sometimes produce useful decisions, and sometimes decisions that undermine allied cohesion. Your June 28 cooperation strengthens your autonomy in the face of that unpredictability.

The trilateral exercises you announced with the United States are valuable. They maintain the American link. But your bilateral Seoul-Tokyo cooperation is even more valuable — because it does not depend on the moods of the White House. You did something on June 28 that governments forever waiting for their cue from Washington never do: you decided for yourselves.

The limits of regional autonomy

I would not want to give the impression that your bilateral cooperation makes the American alliance unnecessary. It does not. The military capabilities of the United States — its naval power in the Pacific, its nuclear arsenal, its intelligence systems — remain irreplaceable for your security. What I am saying is that the robustness of your own cooperation makes you better allies — not less dependent on Washington, but better positioned to carry weight in shared decisions and less vulnerable to shifts in American domestic politics.

What this letter wants to ask of you

Do not let this visit remain a single episode

Ministers, the open letter has this advantage: it can express expectations that official diplomacy does not formulate. My expectation is simple: do not let this June 28, 2026 visit remain an episode. Eleven years of absence were erased in a day because two bombers forced the urgency. But urgencies pass, calendars reassert their rights, historical grievances resurface. The real question is whether you will build, from this meeting, a security relationship sufficiently institutionalized to survive the next disagreements.

The announced joint exercises are a beginning. The cooperation on AI and drones is a foundation. But foundations need to be built upon. I am asking you to build on them — not because the threat demands it, but because two of East Asia's greatest democracies have too much to offer each other to afford eleven new years of distance.

The message to send to Moscow, Beijing, and Pyongyang

The most powerful message you can send to your common adversaries is not a communiqué. It is not a joint exercise. It is not a technological announcement. It is regularity. Annual meetings. Planned exercises. Protocols that function even when your respective governments have tensions on other matters. Moscow, Beijing, and Pyongyang know how to exploit discontinuities. They read years of absence as permission. Your response must be to deny them that reading — by being present, visible, consistent.

The connection with Ukraine: a war that concerns us all

The same threat, two theaters

I want to close this letter with a parallel that some may find forced, but which I consider essential. What is playing out in Ukraine and what is playing out in the Taiwan Strait, in the KADIZ and the JADIZ, are the geographic expressions of the same challenge: authoritarian powers testing the limits of the international liberal order, through force or graduated coercion. Putin in Ukraine, Xi Jinping with Taiwan, Kim Jong-un on the peninsula — they share a common doctrine: the existing order is negotiable, and the West's determination to defend it is limited.

Your June 28 meeting says the opposite. It says the liberal order has defenders in the Asia-Pacific too. It says democracies learn — sometimes too slowly, often under pressure, but they learn. And it says that Sino-Russian provocations produce the opposite of their intended effect: they unite rather than divide. That resilience deserves recognition and encouragement.

What the Atlantic West must learn from you

There is a lesson that the Atlantic West — in Paris, Berlin, Washington — should draw from your June 28 meeting. You set aside decades of grievances to respond to a common threat. You did not resolve your differences — you temporarily moved past them in the name of something more urgent. That is exactly what the Atlantic West should do with regard to Russia — set aside its internal disagreements over Ukraine, over defense budgets, over migration policy, to focus on the essential: maintaining a world order where borders do not change by force.

What this letter acknowledges and what it cannot promise

The limits of declared goodwill

I want to be honest: an open letter does not create foreign policy. It does not allocate budgets, form protocols, or sign treaties. What I write here is an acknowledgment and an appeal — not a guarantee. The challenges you face — a nuclear North Korea, a militarized China, an aggressive Russia, an unpredictable United States — are of a scale that goes beyond any columnist's words.

But words have their use in the public life of democracies. They name what is, they invite what should be, they make visible what official communiqués bury in formulaic phrases. This letter wanted to do all of that — acknowledge the gesture of June 28, place it in context, and ask you to continue.

What I hope for the future

I hope that in five years, Koizumi's visit to Seoul on June 28, 2026 will be seen as the start of a series, not as an exceptional episode. I hope the announced joint exercises have taken place, that the AI cooperation has produced shared systems, that the aerobatic teams have flown together often enough for their pilots to know each other by first name. I hope the Seoul-Tokyo relationship will have become solid enough to withstand the next disagreements — and there will be some. That is what an alliance is: not the absence of tensions, but the capacity to navigate through them together.

What the open letter as a genre can accomplish

Direct address as a political act

The open letter is a particular journalistic genre: it addresses identified individuals publicly, before an audience. It creates a narrative accountability — the recipients are named, their acts are described, their responsibilities spelled out. It also invites a response that official communiqués do not provoke. This genre is useful when ordinary diplomatic channels do not allow naming what is — when drawing-room diplomacy prefers comfortable formulas to calls for continuation.

This letter was one of them. Not because you fell short on June 28 — you did exactly what was needed. But because what was done deserves to be said aloud, before readers who watch this region with a mixture of anxiety and hope. You sent a signal. I wanted to amplify it.

The columnist facing his own responsibility

Writing an open letter to defense ministers carries a risk: that of editorial arrogance, of a columnist who thinks they know better than decision-makers what should be done. I am aware of that risk. I expose myself to it deliberately because I believe a commentator who never takes a position is not a commentator — it is a directory. My position is declared: I support democratic alliances against autocrats, I support Ukrainian resistance against Russian aggression, I support Taiwanese democracy against Chinese pressure, I support the Seoul-Tokyo alliance against Sino-Russian-North Korean coordination. This is not naivety — it is a choice of values.

The Western Pacific as the front line of global democracy

A geography that brings conflicts closer

Ministers, geography says it with the clarity that politics sometimes prefers to avoid: the Western Pacific is the world's most tension-laden theater in 2026. The South China Sea is contested among six nations. The Taiwan Strait is under growing pressure. The Korean peninsula remains divided by a 1953 armistice never replaced by a peace treaty. The Senkaku/Diaoyu islands concentrate permanent tensions between Japan and China. In that landscape, your June 28 alliance is not a peripheral element — it is a central pillar of regional stability.

What you built addresses the full scope of that geography under tension. A robust Seoul-Tokyo alliance makes it more costly to attempt to isolate either capital. It makes it harder for Beijing to exploit bilateral disagreements. It strengthens the credibility of deterrence in a region where every actor is permanently recalculating the balance of power. And it tells Pyongyang that its effort to separate its neighbors has not succeeded.

NATO's lessons for the Asia-Pacific

NATO is often cited as a model for a collective security organization in the Asia-Pacific. The comparison is instructive but imperfect. NATO was built on a shared past, a common Soviet threat, and institutional structures seven decades old. In Asia, colonial histories are more recent, territorial disputes more active, institutional architectures less developed. What you are building is not an "Asian NATO" — it is something adapted to your reality, potentially more durable precisely because it is built from your own strategic geography rather than copied from an Atlantic model.

The technological dimension: AI, drones, and the wars of tomorrow

What the technological cooperation truly means

The announcement of cooperation on AI and unmanned systems deserves special attention. In 2026, after four years of war in Ukraine, any competent military decision-maker knows that drones and autonomous systems have fundamentally changed the nature of combat. Ukrainian FPV drones, long-range strike drones, interceptor drones — these systems have shattered military doctrines that were decades old. Armies that fail to integrate this revolution will be structurally disadvantaged in the next conflict.

Japan and South Korea each possess first-rate industrial and technological capabilities: Japanese robotics, Korean semiconductors, embedded systems, electronic miniaturization. Together, you can develop next-generation drone systems that integrate the Ukrainian lessons and adapt them to the Indo-Pacific context — oceanic, long-distance, against adversaries different from Russian artillery. This cooperation, if it materializes, will be one of the most significant developments in regional security in the coming decade.

Interoperability as a condition for deterrence

Deterrence only works if the adversary believes the response will be swift, coordinated, and effective. For that, military systems interoperability is essential. Two armies that cannot communicate in real time, whose drone systems are incompatible, whose command protocols are not mutually intelligible, do not constitute an effective alliance — they constitute two armies that happen to be in the same region. Your technological cooperation and joint exercises are the answer to that reality. Every shared protocol, every common frequency, every interoperable system makes your alliance more credible in the eyes of your adversaries.

Conclusion: continuity as the only guarantee

June 28 as a starting point

Ministers Koizumi and Ahn, your June 28, 2026 meeting merited this letter. Not because it solved all problems — it could not. Not because it represents a definitive break with eleven years of distance — only time will confirm that. But because it sent, in a moment of growing tension, a signal of solidarity between two neighboring democracies that chose to put strategic urgency ahead of historical grievances. That is a choice worth acknowledging, and acknowledging publicly.

The security architecture of the Asia-Pacific is being built now, in the margins of communiqués and ministry corridors. It is built through joint exercises, shared protocols, technologies developed together. It is built also through letters like this one — public calls for continuity, depth, regularity. I address mine to you with a simple conviction: in a world where autocrats are patient and democracies often distracted, continuity is the most decisive form of resistance.

The last thing I want to say

I want to close with what might have gone unsaid. The day after your June 28 meeting, fewer than 10,000 kilometers away, Ukrainian soldiers were dying in the Donbas trenches facing an army that also kills civilians in Sumy, Kharkiv, and Kherson. Women were being pulled from rubble in Sumy after guided bombs. Men were dying in their cars in Kherson. Those deaths and your meeting in Seoul belong to the same world. The same resistance. The same refusal to capitulate before powers that believe force has the final word. Your meeting was an answer to those deaths — not the only one, not the most direct, but a real one. For that, it deserves to be saluted.

By Maxime Marquette, columnist

A note on my method in this letter: I chose the genre of "open letter" to directly address decision-makers on a specific act. This genre implies an assumed position. All the editorial positions I express here are mine — they are identified as such. The facts I cite are verified by the sources in the Sources section.

A final thought: I wrote this letter from a desk, using open sources, having never set foot in South Korea or Japan. Distance does not preclude understanding — it only requires it to be more rigorous. This letter is the product of that rigor at a distance.

Columnist's transparency note

Declared editorial position and biases

I am in favor of democratic alliances, resistance to authoritarian regimes, and security cooperation in the Asia-Pacific. I regard China, Russia, and North Korea as genuine threats to global security. These positions shape my editorial framing. I do not claim neutrality on these questions — I claim factual rigor in the elements I advance as true. Editorial passages are explicitly identified by the em tags.

What I do not know and the limits of this text

I did not attend the June 28 meeting. I do not know the detailed content of the private discussions between Koizumi and Ahn. I have no direct source in Seoul or Tokyo. My information on the June 27 bomber flights comes from USNI News, which I was unable to consult directly in all its dimensions — the working notes for this piece constitute my primary source for those flights. The limits of what I know are flagged in the text.

Sources

Primary sources

Reuters — South Korea, Japan reaffirm denuclearisation goal, closer defence ties — June 28, 2026

Adnkronos English — Japan's, Korea defense chiefs pledge efforts to enhance exchanges — June 28, 2026

USNI News — Russia, China fly joint bomber missions near Japan and South Korea — June 30, 2026

Secondary sources

The Guardian — International news — accessed July 1, 2026

19FortyFive — Asia-Pacific security analysis — accessed June–July 2026

Foreign Policy — Asia-Pacific geopolitics and defense — accessed June–July 2026

Axios — International news, security — accessed July 1, 2026