Seoul and Kyiv's POW Row Tests Alliance as Sanctions Accusations Fly

On Saturday, South Korea's ambassador to Kyiv boarded a flight back to Seoul. The recall was not routine. It was the latest move in a diplomatic spiral that had turned two countries with shared security interests into accusers, each claiming the other had broken faith.

The rupture began on September 23, when President Volodymyr Zelenskyy stood before the United Nations General Assembly in New York and announced that Ukraine had transferred two captured North Korean soldiers to South Korea. The soldiers had been taken prisoner by Ukrainian forces in Russia's Kursk region in January 2025, fighting alongside Russian troops. It was a straightforward statement of fact. It was also, Seoul insisted, a betrayal.

The South Korean government said the two nations had reached an agreement in mid-September to keep the transfer confidential. Kyiv disputed this, saying no such secrecy pact existed. Seoul responded by accusing Ukraine of lying outright and demanded a public apology and formal explanation. Ukraine offered what it called a "diplomatic understanding" but stopped short of the apology Seoul expected. The temperature kept rising.

Then, last week, a senior adviser to Zelenskyy alleged that more than 176,000 tons of diesel and other fuel products had been shipped to Russia from South Korean ports in July and August—a potential violation of international sanctions. Seoul's presidential office denied the claim. Two days later, it recalled its ambassador.

Why had Seoul wanted secrecy in the first place? Erwin Tan, a professor of international politics at Hankuk University, outlined the reasoning to Deutsche Welle. First, revealing the soldiers' repatriation would likely trigger North Korean retaliation against their families for surrendering. Second, Seoul wanted to preserve its communication channel with Pyongyang—a priority for the left-leaning political wing that includes President Lee Jae Myung, which has historically pursued reconciliation with the North. Kim Sang-woo, a former South Korean politician and board member of the Kim Dae-jung Peace Foundation, confirmed this desire to avoid "friction" with the North. But he also noted that Moscow and Pyongyang would almost certainly discover the transfer eventually, and that Lee was facing domestic criticism for appearing weak in the face of North Korean pressure.

"There is criticism that Lee's administration is effectively appeasing the North, that it has become too soft, and that is a very worrisome situation," Kim said. He expressed surprise at how quickly the dispute escalated. "I think Lee was very angry that he was publicly being accused of lying about the agreement and it rapidly grew into a very messy confrontation."

Why had Zelenskyy chosen to announce the transfer at such a high-profile moment? Kim speculated it may have been a calculated bid for additional support from Seoul. Ukraine could have negotiated a prisoner exchange with Russia, freeing some of its own soldiers in return. Instead, it honored Seoul's request, apparently betting that South Korea would respond with increased financial aid or even military support. The gamble appears to have failed.

Tan predicted the two governments would continue trading accusations in the near term. "Given the high profile nature of the mutual accusations, both sides will probably engage in a mutual blame game for the immediate future, but I doubt that it will turn into a long-term case of mutual acrimony," he said. "I anticipate that after the furor has died down and the press is looking for the next new story, both sides will quietly resume contact on the basis of mutual pragmatism." For now, though, the alliance that had seemed solid enough to weather Russia's invasion of Ukraine was being tested by the very complications that war creates—secrets, leverage, and the question of who owes whom what.