Seoul's Trust Gap With Washington Hits the Alliance Core

South Korea’s top envoy to Washington, Kang Kyung-wha, told lawmakers on Monday that there are “limitations in our communication with the White House.” She called the situation “somewhat frustrating.” It’s a rare public admission from a diplomat, pointing to a problem far beyond protocol: the United States appears to be withholding sensitive intelligence from its ally on the Korean peninsula.

The Intelligence Problem

Kang acknowledged an “issue” with Washington’s sharing of covert data. The strain stems from reports earlier in 2026 that a South Korean official disclosed U.S. intelligence about a secret North Korean nuclear facility. President Lee Jae Myung dismissed the allegations as “absurd.” Local media reported in June, four months ago, that Washington asked South Korea’s spy agency to stay out of a trilateral U.S.-Japan meeting on North Korea.

The timing couldn’t be worse. North Korea has stepped up missile tests, can produce as many as 20 nuclear weapons a year, and has declared the South its “principal enemy.” With less intelligence cooperation, Seoul faces greater difficulty responding to Pyongyang’s growing arsenal.

“The most damaging aspect of the friction over intelligence restrictions is it conveys the U.S. does not have trust in Korea as an ally,” said Victor Cha, Korea chair at the Center for Strategic and International Studies. “It’s serious because it hits at the heart of the military alliance.”

Money and Trade Disputes

The security strain didn’t appear in a vacuum. For months, Washington and Seoul have clashed over U.S. accusations that South Korea delayed its investment deal and discriminated against American-listed e-commerce company Coupang. Those commercial disputes have spilled into security cooperation, adding weight to President Donald Trump’s threat of new trade penalties.

Last month, Lee publicly questioned Washington’s description of Seoul’s participation in a liquefied natural gas project in Alaska, saying cooperation depended on the deal being financially viable. That’s a reasonable commercial position. The White House clearly didn’t welcome it. Trump has complained that South Korea hasn’t done more to help with Iran, while promises to assist Seoul with nuclear-powered submarines remain unfulfilled.

Bloomberg Economics’ Adam Farrar framed the dispute in political terms. “Trump is pushing the Alaska LNG project as he looks to bolster Republicans ahead of the midterms, while Lee has incentives to push back forcefully as he faces weak approval ratings,” he said.

Seoul’s Balancing Act

Lee has told his cabinet that South Korea, as a sovereign nation, should “avoid a submissive or overly deferential approach in relations with other countries.” The policy, described as “pragmatic diplomacy,” seeks warmer relations with China while maintaining close ties to the United States. His spy chief and unification minister are seen as part of a faction that favors better relations with Beijing, a stance some analysts said has gone down badly among China hawks in Washington.

Some tensions have turned personal and political. Reports that a prominent South Korean politician’s visa was held up forced him to cancel a U.S. trip. Trump also scaled back military drills with South Korea. Jenny Town, a senior fellow at the Stimson Center, said Seoul’s problems are “more pronounced in scope and severity” than those of other U.S. allies, painting “a picture of an alliance that’s highly strained and losing trust.”

Former Vice President Kamala Harris criticized Trump in Seoul on Wednesday, saying he had undermined the alliance by cutting drills and using tariffs to threaten partner nations. “America must be strategic in the use of our economic power, not reckless or spiteful,” she said. Her critique, though, comes from outside government and gives her no authority over current policy.

Damage Control

The United States shows no sign of pulling any of its 28,000 troops from the peninsula ahead of schedule. An official at South Korea’s presidential office said the government is working to strengthen trust with Washington and stressed that the alliance is the cornerstone of Seoul’s foreign and security policy. The U.S. State Department declined to comment. The White House didn’t respond to a request for comment.

Lee met Trump briefly in New York last month on the sidelines of the United Nations General Assembly and sought help restarting dialogue with North Korea. “President Trump kindly reminded me of our plan to play golf,” Lee said after the 30-minute meeting. South Korea has since formed a task force to prepare for a golf outing between the two men ahead of the Group of 20 summit in December, two months from now, Yonhap News reported.

Kim Jung, a professor at the University of North Korean Studies in Seoul, noted that during Trump’s first term, South Korea’s national security adviser and intelligence chief played key roles in arranging meetings between Trump and North Korea’s leader. “This government’s ability to manage the situation is now being put to the test,” he said.

Why This Matters:

An alliance depends on trust. Rebuilding it is hard once intelligence channels narrow. Washington provides Seoul with direct military deterrence against a nuclear-armed neighbor, so any decline in information sharing carries real security costs on the peninsula. Disputes over investment, Coupang and the Alaska LNG project show how trade friction can spill into defense cooperation, putting both capitals at risk. Washington faces a fair question: how much sensitive data should it share with a partner courting Beijing? For Seoul, it’s a reminder that sovereignty and deterrence don’t always point in the same direction. With a G20 summit two months away and a possible restart of talks with Pyongyang on the table, both governments have strong reasons to quietly repair the relationship instead of litigating it in public.