South Korea threatens measures against Ukraine over public disclosure of North Korean POW transfer

Ultimatum from Seoul

South Korean President Lee Jae Myung demanded an official apology and acknowledgement of a confidentiality pact from Ukraine on 2 October 2026. The diplomatic confrontation follows remarks by Ukrainian President Volodymyr Zelensky at the United Nations General Assembly, where he revealed that Kyiv transferred two captured North Korean prisoners of war to South Korea. South Korea's presidential office stated that both governments had agreed to keep the operation secret to protect the prisoners and their families living in North Korea. Seoul summoned Ukrainian chargé d'affaires Andriy Vyeshkin to lodge a formal protest and demanded an explanation for the public disclosure. President Lee warned on social media that South Korea would enact unspecified retaliatory steps if Kyiv maintains its denial.

If the refusal to acknowledge the facts and issue a public apology continues, we will take additional measures.

Conflicting accounts of confidentiality

The dispute centers on whether an explicit confidentiality agreement existed before the transfer took place. Senior South Korean presidential secretary Seong Ghi-hong stated that Ukrainian officials repeatedly discussed the transfer through official diplomatic channels and explicitly requested confidentiality. According to South Korean officials, Kyiv had sought secrecy to avoid domestic criticism over relinquishing North Korean captives who could have been exchanged for captured Ukrainian soldiers in Russia. In response, Dmytro Lytvyn, a communications adviser to President Zelensky, posted on social media that no secrecy agreement was ever concluded and argued against concealing the destination of the captives. The public disclosure triggered domestic political friction in Seoul, where opposition lawmakers accused Lee of concealing the transfer to appease Pyongyang.

Kyiv seeks diplomatic de-escalation

Ukrainian Foreign Minister Andrii Sybiha moved to contain the diplomatic rift during media appearances on 1 October 2026, characterizing the dispute as a bilateral misunderstanding. Sybiha reaffirmed South Korea's strategic importance as a partner and expressed optimism that working-level talks would resolve the tension quickly. However, President Lee rejected this framing, stating that the dispute touched the honor and dignity of the South Korean public. Lee also expressed grave regret over Ukrainian public statements warning of an imminent military clash on the Korean Peninsula, describing such rhetoric as an attempt to encourage conflict in the region.

I would not like to call this an incident. Let's say, it's a diplomatic misunderstanding.

Broader strategic relations and North Korean deployment

The two captured soldiers were taken by Ukrainian forces in January 2025 during fighting in Russia's Kursk region, representing the first live North Korean captives in the conflict. Prior to their transfer, both soldiers expressed a desire to resettle in South Korea. North Korea previously dispatched an estimated 14,000 personnel to assist Russian operations in Kursk, with Ukrainian assessments indicating that over 8,000 troops remain active in Russia alongside 10,000 recruits currently undergoing training. South Korea has provided non-lethal, humanitarian, and financial support to Ukraine since 2022, including a $100 million commitment announced at the NATO summit in July 2026. Cho Han-bum, a senior fellow at the Korea Institute for National Unification, stated that South Korea's potential retaliatory measures could target ongoing financial, humanitarian, and reconstruction aid packages.