The POWs Seoul Wanted Kept Secret

Two prisoners, one broken secret, and an ultimatum posted on X. On Friday, South Korea's president told Ukraine to admit a confidentiality pact over two North Korean soldiers — and apologize — or face “additional measures.” The war in Europe has just exported its ugliest argument to the Korean Peninsula.

On Friday morning, South Korea's president did what heads of state once reserved for sealed cables: he issued an ultimatum on X. “If the refusal to acknowledge the facts and issue a public apology continues, we will take additional measures,” Lee Jae Myung wrote, addressing Ukraine — not Moscow, not Pyongyang, but Kyiv: a partner, a fellow American ally, a country his government has quietly bankrolled for years. The demand came in two parts. First: acknowledge that a confidentiality agreement covered the transfer of two North Korean prisoners of war captured fighting for Russia. Second: apologize for breaking it. Lee then added the diplomatic equivalent of a blade between the ribs: “grave regret” over Ukrainian remarks about an imminent military clash between North and South Korea — remarks he said amounted to encouraging war on the Korean Peninsula. Read the week backwards and the ultimatum looks less like a spasm than a staircase. Monday: Seoul summoned Ukraine's acting ambassador, Andrii Vieshkin, for a formal dressing-down. Wednesday: South Korea's spy agency briefed lawmakers behind closed doors on how the secrecy pact was supposedly built. Thursday: Ukraine's foreign minister, Andrii Sybiha, tried the soothing route — “a diplomatic misunderstanding,” he called it, insisting Kyiv was working to mend ties. Friday: Lee dropped the hammer. Five days, five escalations, each one public, each one designed to be seen. And note the channel: Lee has fought this entire dispute in public, post by post, from Mexico City to Seoul — diplomacy as theater, with the peninsula's fifty million people in the front row. Consider what is actually at stake: two men, known to the public only by their surnames, Ri and Baek. One of them tried to kill himself rather than be taken alive. They are now living proof of a proposition the Korean Peninsula understands better than any place on earth — that prisoners are not just people. They are currency. And right now, the exchange rate is collapsing.

Seoul Builds Its Legal Case in Public

The ultimatum's wording is worth reading slowly, because Seoul is building a legal case in public. “Although Ukraine requested private handling and an agreement was reached to keep it confidential, they unilaterally made the matter public,” Lee wrote on Friday. The sequence matters to Seoul: Kyiv asked for secrecy, both sides agreed, Kyiv broke the deal. Lee further accused Ukraine of making him out to be a “liar” by denying any non-disclosure pact ever existed — a personal charge that explains the heat. This is no longer a disagreement about two prisoners. It is a fight about who is telling the truth, and a president does not call a wartime ally's government liars on social media unless he believes the domestic cost of silence is worse. Seoul's version of the pact, as briefed to lawmakers Wednesday by the National Intelligence Service, is granular. There was no single signed document between leaders — “We do not know whether there was an agreement between the leaders,” the NIS said — but there was, the agency insisted, a nondisclosure understanding “through several channels, including phone calls between the two countries' foreign ministers and consultations between our embassy [in Kyiv] and Ukraine's Foreign Ministry.” Consultations on the two soldiers began on January 9, 2025, the day of their capture. The logic, in Lee's telling, was humanitarian, diplomatic and security-driven: the men's families in North Korea would be at risk; Pyongyang would read the transfer as provocation; and Seoul's fragile effort to lower inter-Korean tensions could not survive a public spectacle. “It was reasonable and justifiable” to keep it secret, Lee wrote in September — a line that now reads like the preamble to Friday's threat. Kyiv's version is simpler, and flatly contradictory. “There was no such (non-disclosure) agreement. That is not true,” Dmitro Litvin, an adviser to President Volodymyr Zelensky, wrote — adding that “it would be wrong to conceal the whereabouts of specific prisoners.” Ukraine, in other words, denies the premise of the ultimatum entirely. You cannot apologize for breaking a promise you never made.

How we got here

Two men crossed a border on a battlefield, and the war followed them home — Seoul wanted them protected; Kyiv needed them seen.

Before the row, there were the men. Ri and Baek — only surnames have been made public — were among an estimated 14,000 to 15,000 North Korean troops Pyongyang has dispatched to fight for Russia since 2024, under the mutual defense pact the two countries signed. Ukrainian forces captured them in Russia's Kursk region in January 2025, the first North Korean soldiers taken alive in the war. Zelensky himself narrated the capture at the United Nations: “These guys are not easy to capture alive. One of them, when he realized he was going to be taken prisoner, tried to kill himself. And he was shocked that fate did not let him die.” What followed is the part of the story neither capital disputes. Zelensky published their photographs and interrogation footage, then offered to hand them to North Korea in exchange for Ukrainians held by Russia. The two men, instead, said they wanted to go to South Korea — whose constitution treats North Koreans as its own citizens. They arrived in mid-September, and are now undergoing questioning under the protection of government agencies. The NIS says it confirmed several times that they genuinely wished to come, and that they have no major health problems. Why secrecy, then? Seoul's answer has three layers, and each one is real. The humanitarian layer: the men's families in North Korea face retaliation the moment their defection is confirmed — a pattern as old as the armistice. The security layer: Pyongyang, which has spent the year tightening its military bond with Moscow, reads any public handling of “its” soldiers by Seoul as a provocation. The diplomatic layer: Lee's government has been trying, against the grain, to reduce tensions with the North — a project that detonated this week when a suspected landmine explosion in the Demilitarized Zone injured three South Korean soldiers. Disclosure, in this reading, was not a communications choice. It was a detonation. The fuse was lit on September 23, at the United Nations General Assembly in New York. “Recently, we sent two North Korean prisoners of war to the Republic of Korea,” Zelensky said, addressing South Korea by its formal name — the first public acknowledgment of a transfer completed in mid-September. Seoul, which had said nothing until then, erupted within hours. On September 24, Lee wrote on X that the disclosure was “deeply regrettable” — a breach of the confidentiality both sides had agreed to. He went further, in language that startled even seasoned Korea-watchers: “We call someone who harms another person's life and the national interest and security for their own petty gain a murderer or a traitor.” Russian outlets, delighted, read it as a personal broadside against Zelensky. The days that followed hardened the positions. On Sunday, Lee's senior presidential secretary for public relations, Seong Ghi-hong, issued a formal statement: “The presidential office expresses strong regret over Ukraine's unilateral disclosure and its subsequent false announcement that there had not been a non-disclosure agreement,” adding that the government was reviewing additional measures. Seoul said Ukraine had repeatedly discussed the transfer through various channels and had requested secrecy itself — Kyiv, by Seoul's account, feared domestic criticism at home for giving up an opportunity to exchange the soldiers for Ukrainian prisoners. On Monday, Seoul summoned Ukraine's acting ambassador. Then came the wrinkle neither side can fully explain away: Kyiv had, in fact, informed Seoul in advance that Zelensky would mention the prisoners at the UN. “The Ukrainian side had informed us in advance and sought our understanding,” a senior presidential official said in Mexico City — but “it was unclear exactly how the matter would be phrased.” The dispute has also cracked open inside Ukraine itself. Oksana Torop, a media adviser to Valerii Zaluzhnyi — Ukraine's ambassador to London and Zelensky's most prominent potential rival — wrote on Facebook that a non-disclosure agreement did exist and called the UNGA announcement a “show.” Litvin shot back publicly: no agreement, not true. Whatever the truth about the pact, Kyiv is now arguing about it with itself.

The 5D read

Strip away the personalities and the row is a textbook study in how little room Seoul has left to maneuver — the geopolitics dimension, first. Lee's government came to office promising to lower the temperature with Pyongyang, a detente project that has consumed his first months. The suspected DMZ landmine blast that injured three South Korean soldiers this week landed squarely in the middle of that project, handing his conservative critics — who already accuse him of being excessively cautious toward Pyongyang — a live provocation to wave. In that context, Zelensky's disclosure was not a minor breach of etiquette. It was a grenade rolled into Lee's most delicate policy. The triangle is unforgiving. North Korea has signed a mutual defense pact with Russia and sent up to 15,000 troops to its war; Zelensky said this week that more than 8,000 North Korean soldiers remain in Russia and 10,000 more are being trained for deployment. Any public handling of captured North Korean soldiers by Seoul risks being read in Pyongyang as Seoul joining the war effort against the North's ally — precisely the escalation Lee's detente is designed to avoid. Meanwhile Washington watches two of its most capable aligned democracies brawling in public, a spectacle that could complicate American efforts to shore up a united global front to contain Russia, China and North Korea. And Kyiv, for its part, has a motive Seoul's own spies have named: the NIS assessed that Zelensky went public in hopes that South Korean public opinion would swing behind sending weapons and more aid to Ukraine. Ukraine set no conditions for the transfer and Seoul promised nothing — but the UNGA stage was, in this reading, a pressure tactic dressed as transparency. The macroeconomics dimension is where the ultimatum bites. South Korea has backed Ukraine with humanitarian and financial assistance since the full-scale invasion of 2022, and in July pledged a further $100 million in non-lethal assistance. That support — humanitarian, financial, reconstruction — is precisely what “additional measures” would target, according to Cho Han-bum, a senior fellow at the Korea Institute for National Unification: “Ukraine has more to lose than South Korea because it is receiving support from Seoul.” It is the classic asymmetry of aid as leverage: the donor threatens to close the tap, the recipient discovers how much of its resilience was rented. Note what Lee has not threatened: weapons. Seoul has held the line on lethal aid throughout the war, and the NIS briefing stressed that no promises of support were made in exchange for the prisoners. The row may yet force that line into question — which is exactly why Kyiv wanted Korean public opinion stirred in the first place. The historical dimension is older than either presidency. Prisoners have been diplomatic currency on this peninsula since the Korean War, when the question of who would be repatriated — and who refused to go — nearly sank the armistice talks. Zelensky's original offer, trading the two men for Ukrainians held by Russia, was straight from that playbook; spending them instead on a UNGA applause line, as Seoul sees it, debased the currency. And the structural dimension — how information war now works — is the deepest cut. Interrogation videos posted for the world, a transfer announced on the General Assembly floor: in the age of the permanent camera, a prisoner's body is a broadcast asset, and whoever controls the footage controls the narrative. Seoul wanted these men to disappear quietly into new lives. Kyiv needed them to be seen. The demographic and human dimension is the one both capitals claim and neither can fully own: the two men themselves, and the families they left behind. In the North, a confirmed defection can mean punishment for three generations of kin — which is why Seoul's humanitarian argument for secrecy is not posturing. But the men also chose the South, freely and repeatedly, under a constitution that claims them as citizens. They are not symbols. They are the only parties to this dispute who never asked to be in it.

What to watch

Watch first for Kyiv's answer. Foreign Minister Sybiha has already chosen his register: “I would not like to call this an incident. Let's say, it's a diplomatic misunderstanding.” “For us, South Korea is an important country,” he added, promising “momentum, continuation, and concrete results.” That is the language of a government that knows it needs Seoul more than Seoul needs it — and that an apology, however bitter, costs less than a ruptured aid pipeline. Whether Zelensky himself apologizes is another matter; nothing in his record suggests he surrenders narrative ground easily, and the internal split — Torop versus Litvin — shows his own camp cannot agree on what was promised. Watch second for the content of “additional measures.” The menu runs from the symbolic (postponed visits, cooled rhetoric) to the material (frozen humanitarian tranches, stalled reconstruction commitments, reviewed financial assistance). Any of it would be unprecedented: South Korea has never sanctioned a fellow American-aligned democracy over a bilateral spat. Watch third for the DMZ landmine investigation — if Pyongyang is found responsible, Lee's detente project faces its hardest test yet, and the POW row will look like the undercard. Watch fourth for Washington. The United States has said little, but American diplomats detest public allied-on-allied feuds, and the pressure to quietly broker a face-saving formula — acknowledgment without humiliation, apology without admission — will be intense. And watch, finally, for Pyongyang's own reading. North Korea has not yet spoken. When it does, the words will matter less than the missiles: every disclosure about “its” soldiers is, to Kim Jong Un, a reminder that his troops are dying in someone else's war — and that Seoul now holds two of them. The soldiers nobody can agree on are, in the end, a mirror. Seoul looks at Ri and Baek and sees two human beings whose families' lives depend on discretion — and a presidency whose signature project, lowering the temperature with the North, cannot survive another public detonation. Kyiv looks at the same two men and sees proof, broadcast to the world, that North Korea is bleeding for Russia — and a lever to pry open the arsenal of Asia's most formidable arms industry. Both readings are sincere. Both cannot be true at once. That is what makes the row intractable, and that is what makes it revealing. For what the rupture really exposes is the geometry of Seoul's position in 2026: a middle power lashed to Washington's alliance system, courted by a wartime Kyiv, and living — as it always has — within artillery range of Pyongyang. Lee Jae Myung's ultimatum is an attempt to prove that the middle can set terms: acknowledge the pact, apologize, or pay. Whether Ukraine pays in pride or in aid tranches, the deeper bill has already arrived. Two prisoners crossed from a Russian battlefield into South Korean custody, and the war followed them home. On the Korean Peninsula, nothing — not even a secret — stays buried for long.

The Western read of this row is sympathetic to Ukraine's reflex and uneasy about Seoul's. Zelensky's instinct — that a war's truths belong in daylight, announced from the General Assembly floor — is the instinct of a leader who has survived on narrative oxygen for four years. From London, Paris and Washington, the idea that two prisoners' whereabouts should have stayed secret sits awkwardly with the transparency norms the West preaches. And yet Western capitals are quietly alarmed, because the fracture is real and the timing is terrible: two of the West's most capable aligned democracies are feuding in public while Moscow and Pyongyang deepen their military embrace. The “liar” charge, in particular, landed badly — Seoul is not some peripheral donor to be strong-armed; it is the arsenal of democracy's Pacific wing, a $100-million-plus backer of Ukraine's survival, and a capital whose restraint on lethal aid has always been a Western hope, not a Western right.

What the West wants now is de-escalation without humiliation: a formula in which Kyiv acknowledges the confidentiality understanding — even without conceding every word of Seoul's version — and Lee pockets the apology and moves on. American diplomats, experienced in brokering allied spats from Ankara to Tokyo, will be working the phones, because the alternative is genuinely dangerous. If Seoul follows through on “additional measures” and trims its humanitarian, financial and reconstruction support, Ukraine loses a quiet but meaningful lifeline — and the West's united front against the Russia–North Korea axis develops a visible crack. Nobody in the Western camp believes two prisoners are worth that price. The question is whether either president can afford to say so first.

The Eastern read starts from the peninsula itself, where the row looks less like a diplomatic accident than an inevitability. Seoul's detente project — lowering the temperature with a nuclear-armed neighbor that has just buried its soldiers in a European war — was always going to collide with somebody's communications strategy, and Kyiv's happened to be first. Tokyo, watching from across the strait, reads the episode as confirmation of its own doctrine: inter-Korean stability is a regional public good, and anyone who treats the peninsula as a stage for someone else's war risks breaking it. The region also understands Seoul's secrecy instinct in its bones: on this peninsula, prisoner politics are never abstract — they are families, retaliation, three generations of punishment — and discretion has always been the price of getting people out alive.

Moscow, meanwhile, is enjoying itself. Russian outlets like Moskovsky Komsomolets have gleefully framed Lee's “murderer or traitor” passage as a personal denunciation of Zelensky, and the Kremlin's broader read is strategic: every public crack between American-aligned capitals is proof that the Western coalition is a fiction, and every North Korean soldier in Russian uniform is a receipt for the mutual defense pact. Beijing watches the same crack with different eyes — a reminder that Washington's Asian alliances come with their own tripwires, and that Seoul's room for maneuver shrinks every time someone else's war washes up on its shores. The Eastern verdict: the prisoners were never the story. The triangle is.

The Global South read is cooler, and more skeptical of both capitals. From Doha to Dhaka, the row looks like two American-aligned states discovering that alignment is not alliance — that Washington's friends can still wound each other over interests Washington never bothered to reconcile. Al Jazeera's framing caught the essential absurdity: two powerful militaries, both facing down common adversaries, reduced to trading ultimatums on social media over two soldiers neither public had heard of a month ago. The South also notices the asymmetry that Seoul is now brandishing: aid as a leash. When a donor threatens to close the tap over a bilateral slight, every recipient capital in the developing world — from Kyiv to Khartoum — hears the same message about what “partnership” really means.

But the South's deepest sympathy is reserved for the two men at the center, and it is unsentimental. Ri and Baek are not the first soldiers of a poor country to be spent as currency in a rich country's war, and they will not be the last — conscripted by Pyongyang, captured in Kursk, filmed for the cameras, offered in a swap, claimed by a constitution, and now held hostage to a diplomatic row they never chose. The Global South has watched this film before, in other uniforms and other languages. Its verdict on the row is weary rather than outraged: the great powers will reconcile or they won't, the aid will flow or it won't — but the two men will still be the ones paying. Whatever Seoul and Kyiv decide, the South will be watching what happens to Ri and Baek. That is the only ledger that matters.