Ukrainian allegations of fuel shipments

Vladyslav Vlasiuk, Ukraine's presidential commissioner for sanctions policy, stated that Russia imported over 176,000 tonnes of petroleum products from South Korean ports in July and August 2026. Vlasiuk reported that fuel from South Korea constituted 31% of Russian fuel imports in August. The deliveries coincided with Ukrainian drone strikes against Russian refineries and depots, which forced Moscow to ban diesel and gasoline exports and ration regional supplies. International Energy Agency data recorded that Russian refinery throughput fell in June to its lowest level in over 20 years, while annual diesel output dropped by nearly 30%. Vlasiuk asserted that the cargo helped Moscow withstand these domestic supply disruptions.

Vlasiuk assessed the impact on Russian energy resilience on social media.

In effect, imports from South Korea helped Russia offset the impact of losing its own refining capacity.

Tanker movements and export controls

Port documentation and tracking records reviewed by The Guardian showed seven tankers completed 14 voyages from South Korean ports to Russia's far east during the two-month period. Three of the seven vessels were subject to sanctions enacted by the United Kingdom and the European Union. One vessel received roughly 26,000 tonnes through a ship-to-ship transfer at an anchorage near Yeosu. In an official response, South Korea's foreign and trade ministries together with the customs service noted that refined petroleum products do not appear on South Korea's export control list for Russia. Those restrictions target industrial machinery, motor vehicles, and electronics rather than commercial diesel or jet fuel. Authorities added that no fuel had been cleared through South Korean customs with Russia declared as the destination.

Seoul opens legal inquiry

The South Korean government announced that domestic agencies are verifying the shipment records and will pursue legal action if regulations were breached. Presidential spokesperson Kang Yu-jung rejected Kyiv's claims on Wednesday and defended the state's record of enforcing international sanctions.

Since Russia's invasion of Ukraine, our government has consistently implemented sanctions and export controls against Russia in close cooperation with the international community.

Kang asked Ukraine to refrain from making assertions that distort South Korean policy without establishing the underlying facts. South Korean trade authorities noted that vessels changing destination after departure do not automatically establish a fraudulent export filing under domestic maritime law. Port logs do not publicly identify the ultimate commercial sellers or buyers of the cargoes.

Escalating diplomatic friction

The disagreement adds to existing friction between Seoul and Kyiv that developed in September 2026. Bilateral relations deteriorated after Ukrainian President Volodymyr Zelenskyy announced at the United Nations General Assembly that Kyiv had transferred two North Korean prisoners of war to South Korea. Seoul demanded an apology, maintaining that the transfer was meant to remain confidential. Ukrainian officials denied the existence of a binding non-disclosure arrangement. Ukrainian Foreign Ministry spokesperson Heorhii Tykhyi told reporters on Wednesday that the two governments are using private diplomatic channels to resolve the disagreement over confidentiality terms. Ties remain sensitive as South Korean and Ukrainian intelligence estimate that North Korea sent 14,000 to 15,000 soldiers to assist Russian forces, following a mutual defence treaty signed between Moscow and Pyongyang in 2024.