Transfer of North Korean POWs Triggers South Korea-Ukraine Dispute; Allegations of Energy Exports to Russia Expose Gray Areas in Sanctions Enforcement

The diplomatic storm over the fate of two North Korean prisoners of war is pushingg relations between Seoul and Kyiv toward a serious crisis. According to Deutsche Welle, Ukrainian President Zelensky publicly revealed at the United Nations General Assembly in New York on September 23 that Ukraine had transferred two North Korean soldiers captured in Russia's Kursk region to South Korea in mid-September. The transfer, which was supposed to be carried out in secret, triggered mutual accusations between South Korea and Ukraine because of Zelensky's public announcement, and the subsequent allegations of energy exports pushed the dispute into deeper cracks in the sanctions enforcement chain.

The two North Korean soldiers were captured by Ukrainian forces in January 2025 while fighting alongside Russian troops in the Kursk region. The office of South Korean President Lee Jae-myung subsequently denied allegations that Ukraine had violated international sanctions and recalled the ambassador to Kyiv two days later. South Korea insists that both sides reached a confidentiality agreement on the transfer, while Ukraine clearly denies the existence of any confidentiality arrangement and has refused to issue the public apology demanded by Seoul. Deutsche Welle cited analysts as saying that Seoul's urgent need for confidentiality stems from two considerations: once it becomes public that the two North Korean soldiers were sent to the South, Pyongyang might retaliate against the POWs' families; meanwhile, the Lee Jae-myung administration belongs to the wing of the South Korean political spectrum inclined toward dialogue with North Korea, and maintaining communication channels with Pyongyang is an important policy option.

What really stirred geopolitical nerves was data subsequently released by a close advisor to Zelensky: more than 176,000 tonnes of diesel and other energy products were shipped from South Korean ports to Russia between July and August this year — if true, this would constitute a significant erosion of the international sanctions framework. Kyiv's public naming of South Korean ports for energy exports to Russia reflects strong dissatisfaction with allies' enforcement capabilities under the pressure of the frontline battlefield. The South Korean government denied the allegations but did not close off outside questions about gray areas in the Western-led sanctions chain.

Another source of pressure behind Seoul's public demand for an apology comes from within South Korea. Deutsche Welle cited Kim Sang-woo, a board member of the Kim Dae-jung Peace Foundation, as saying that the Lee Jae-myung government's attitude toward Pyongyang is being labeled "appeasement," and "being too soft on the North" has become a political concern. Lee Jae-myung was also furious at being publicly accused of lying about the agreement, and at the same time was seized upon by domestic opponents as a sign of weakness.

Regarding why Zelensky chose to publicly reveal the transfer at the UN General Assembly, the highest-profile venue, Kim Sang-woo's analysis to Deutsche Welle was that this may have been Kyiv's "calculation" — Ukraine could have recovered its own captured personnel through a prisoner exchange with Russia, but instead chose to respond to Seoul's confidentiality request, expecting that cooperation would bring further financial and even military support from South Korea, yet this gamble now appears to have backfired.

Erwin Tan, a professor of international politics at Hanyang University, expects that the high-profile mutual recriminations between the two sides will continue for some time, but are unlikely to develop into long-term hostility. "After the uproar subsides and the media moves on to the next story, the two sides will likely quietly resume contact on a pragmatic basis," he told Deutsche Welle.

On whether a confidentiality agreement exists, the two sides each stick to their own version; the specific evidence and source chain for the 176,000 tonnes of diesel transiting South Korean ports to Russia have not been made public; analysts differ on whether South Korea-Ukraine relations will cool down or continue to confront each other.