Ukraine and South Korea clash over disclosure of North Korean POW transfer

Why it matters

The dispute is a rare public falling-out between Ukraine and one of its main non-lethal aid donors over the handling of sensitive POW information. It tests whether a high-profile international disclosure by Kyiv can coexist with quiet bilateral understandings, and comes as South Korea weighs its broader humanitarian and diplomatic support for Ukraine. The clash also unfolds against the backdrop of North Korea's deepening military involvement in Russia's war, with Pyongyang having deployed tens of thousands of troops.

What happened

On 23 September 2026, Ukrainian President Volodymyr Zelensky, speaking at the UN General Assembly in New York, announced that Ukraine had recently transferred two North Korean prisoners of war to South Korea. Zelensky said North Korean soldiers are difficult to capture alive and that one of the two had attempted suicide upon realizing he had been taken prisoner; the two had been captured in Russia's Kursk Oblast in 2025. A senior South Korean presidential official said Kyiv had warned Seoul in advance through diplomatic channels that Zelensky intended to mention the POWs, and asked for understanding, though the exact wording was not known in advance.

On 24 September, South Korean President Lee Jae-myung wrote on X that Zelensky's disclosure caused 'deep regret' and constituted a breach of a confidentiality agreement, describing the issue of repatriating North Korean POWs as 'extremely sensitive' with major implications for diplomacy, national security, and the Korean Peninsula. South Korea's senior presidential secretary for public affairs, Song Ki-hon, said the presidential office 'expresses deep regret' over Ukraine's unilateral disclosure and its subsequent 'untruthful' claim that no confidentiality agreement existed, and demanded an official explanation and apology.

Ukraine's Office of the President and presidential communications advisor Dmytro Lytvyn responded that Ukraine had not undertaken any obligation not to disclose the transfer and that South Korea had not demanded non-disclosure of details. Lytvyn said it would be wrong to hide where POWs end up. Song Ki-hon said Ukraine's denial seriously undermines bilateral trust, and that South Korea is considering additional measures. On 28 September, South Korea's Ministry of Foreign Affairs summoned Ukraine's acting ambassador, Andrii Vieshkin; First Deputy Foreign Minister Park Yoon-joo conveyed Seoul's firm position and called on Kyiv to apologize.

How Ukrainian sources describe it

Ukrainian coverage centers on Zelensky's UN announcement and presents Ukraine as having no confidentiality obligation to hide the transfer. The Office of the President and communications advisor Dmytro Lytvyn have publicly rejected the existence of any agreement, and several Ukrainian outlets frame the row as a diplomatic escalation triggered by Seoul, pointing to South Korea's summons of Ukraine's acting ambassador. Some Ukrainian sources, including reporting picked up by LIGA.net, suggest Kyiv is working to defuse the dispute behind closed doors rather than escalate publicly.

How international sources describe it

International coverage, including South Korea–based outlets, Reuters, the Financial Times and the BBC, emphasizes Seoul's framing that Ukraine unilaterally broke a confidentiality agreement. South Korean outlets and the presidential office have highlighted senior secretary Song Ki-hon's demand for an apology and the possibility of additional measures, as well as domestic political pressure on President Lee Jae-myung from the opposition, which accused him of covering it up to appease Pyongyang. Foreign reporting also places the dispute alongside South Korea's continued non-lethal aid to Ukraine — a $100 million package announced in July 2026 — and frames the row as a test of bilateral ties separate from the POW issue itself.

Where reporting differs

The two governments openly disagree on whether a binding confidentiality agreement existed. South Korea, including the presidential office and President Lee Jae-myung, asserts that a mutual understanding was reached and violated; Ukraine's Office of the President and Dmytro Lytvyn deny any such agreement or obligation was ever undertaken or demanded. The two sides also differ on the nature of any advance notice: a senior South Korean presidential official said Kyiv warned Seoul through diplomatic channels that Zelensky would mention the POWs, while Song Ki-hon characterized the disclosure as made 'without sufficient prior consultations,' and an unnamed senior Ukrainian official cited by the Financial Times said there was no presidential-level agreement not to disclose and described Seoul's expectation of secrecy as 'strange' since the topic had been discussed all summer.

Background

North Korean POWs captured in Russia's Kursk Oblast in 2025 became one of the few substantive topics in Ukraine–South Korea dialogue. In late May 2025 South Korea asked that North Korean POWs not be included in '1000 for 1000' prisoner exchange lists, and in June 2026 Seoul said it was ready to accept captured North Korean servicemen who wished to be transferred to South Korea, opposing their forced return to Russia or North Korea. Under South Korea's constitution all Koreans, including North Korean residents, are considered South Korean citizens. In July 2026 Seoul announced a $100 million assistance package to Ukraine, expanding earlier non-lethal aid such as helmets, body armor, and medical equipment, while maintaining a longstanding policy against providing lethal weapons to states at war. On 17 September 2026 Zelensky said North Korea had sent between 30,000 and 50,000 soldiers to Russia who gained real combat experience and training.