A data breach at South Korea's largest online retailer, Coupang, has escalated from a corporate crisis into a major diplomatic row between Seoul and the Trump administration, threatening to further strain bilateral relations.
Background of the Breach
In November 2023, Coupang disclosed that a former employee had stolen an internal security key, compromising the personal data of 33.7 million users. The breach triggered a massive consumer backlash and a comprehensive government response, including police raids on the company's Seoul headquarters, a special tax audit, and parliamentary hearings. Founder and CEO Bom Kim, a Korean-American billionaire, refused to travel to South Korea for questioning, citing his global role. Korean police have asked immigration authorities to notify them if he enters the country.
Diplomatic Fallout
Reports suggest that the strength of Seoul's response may have jeopardized relations with Washington. Korean broadcaster SBS reported that the US signaled it would not proceed with high-level diplomatic and defense consultations unless South Korea guaranteed Kim would face no legal consequences. South Korea's foreign ministry has not denied the report but stated that security discussions should proceed separately from the Coupang matter, emphasizing that investigations will continue under Korean law. The US embassy in Seoul declined to comment.
Impact on Security Talks
The dispute has affected discussions on US support for South Korea's development of nuclear-powered submarines. Korean officials say a scheduled visit from a US delegation has been postponed. This is one of several tensions between Seoul and Washington under the Trump administration, including an immigration raid at a Hyundai-LG battery plant in Georgia that detained over 300 South Korean workers, partial restrictions on intelligence sharing, and threats to raise tariffs on South Korean goods from 15% to 25%.
Lobbying and Political Pressure
Coupang spent over $3 million lobbying the US government in 2025, bringing its total since 2021 to more than $11 million, according to OpenSecrets. In the first quarter of 2026, the company doubled its lobbying spending compared to the same period in 2025, targeting the White House, including the executive office of the president and the vice president's office. In January, Vice President JD Vance raised the Coupang issue during a visit by South Korean Prime Minister Kim Min-seok, expressing hope for a fair resolution.
On April 21, 54 Republican members of Congress wrote to South Korea's ambassador, accusing Seoul of discriminatory actions against US companies and launching a whole-of-government assault on Coupang over what they characterized as a low-sensitivity data leak. The reasons for such strong congressional and administration support remain unclear.
Arbitration and Expert Views
Five US investment firms holding Coupang shares have filed notices of intent to pursue arbitration against South Korea under the US-Korea free trade agreement, claiming Seoul's enforcement was disproportionate compared to similar cases involving Korean companies. The arbitration process is ongoing.
Jaechun Kim, a professor of international relations at Sogang University in Seoul, noted that the fundamental issue is how South Korea's legal actions are perceived and politicized within the alliance framework. The Trump administration's tendency to blur economic and security issues into a transactional framework means disputes like Coupang could affect areas previously insulated from retaliation, including nuclear cooperation, advanced technology sharing, and defense procurement. He warned that the US-ROK relationship may be approaching a critical threshold of strain.
