U.S. Tightens Intelligence Grip on South Korea

South Korea’s top envoy to Washington, Kang Kyung-wha, told lawmakers Monday that limits on U.S. intelligence sharing were obstructing communication with the White House. “There are limitations in our communication with the White House,” she said. “I find it somewhat frustrating.” Washington controls what information it shares, leaving Seoul with a harder task as it responds to North Korea. The alliance’s security machinery is showing its hierarchy.

Who Controls the Information

Reports earlier in 2026 said a South Korean official had disclosed U.S. intelligence about a secret North Korean nuclear facility. South Korean President Lee Jae Myung rejected the allegations as “absurd.” The dispute has spilled into security cooperation: reduced intelligence sharing makes it harder for Seoul to respond to Pyongyang’s growing nuclear arsenal.

The limits have surfaced beyond intelligence. Local media reported in June that, at Washington’s request, South Korea’s spy agency didn’t attend a trilateral U.S.-Japan meeting on North Korea. A prominent South Korean politician also had to cancel a U.S. trip that month after reports that his visa was held up. Washington had scaled back military drills with South Korea, too.

The United States showed no sign it would withdraw any of its 28,000 troops stationed on the Korean peninsula ahead of schedule. Yet the alliance’s military presence hasn’t prevented disputes over who gets information or how much influence Washington exercises over Seoul’s security decisions. North Korea can produce as many as 20 nuclear weapons a year and has declared the South its “principal enemy.”

Victor Cha, Korea chair at the Center for Strategic and International Studies, said the restrictions signal distrust. “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,” he said. “It's serious because it hits at the heart of the military alliance.”

Trade Pressure, Security Costs

The intelligence dispute comes amid months of friction over U.S. accusations that South Korea delayed its investment deal and discriminated against American-listed e-commerce company Coupang. The disputes add weight to U.S. President Donald Trump’s threat of new trade penalties, even as security cooperation faces strain.

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. Trump’s complaints that South Korea hadn’t done more to help with Iran, along with unfulfilled U.S. promises to assist Seoul with nuclear-powered submarines, had further soured relations.

Bloomberg Economics’ Adam Farrar said domestic political pressures were intensifying the dispute. “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.” Election calculations and trade leverage shape an alliance whose security costs land on Seoul.

Diplomacy on Washington’s Terms

Lee met Trump briefly in New York last month on the sidelines of the United Nations General Assembly, seeking 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 later set up a task force to prepare for a golf outing between the two men ahead of the Group of 20 summit in December, Yonhap News reported.

Lee told his cabinet that week that South Korea, as a sovereign nation, should “avoid a submissive or overly deferential approach in relations with other countries.” His government calls its approach “pragmatic diplomacy,” seeking warmer relations with China while maintaining close ties with the United States. His spy chief and unification minister were seen as part of a faction favoring better relations with Beijing, a position some analysts said had gone down badly among China hawks in Washington.

Jenny Town, a senior fellow at the Stimson Center, said South Korea’s problems were “more pronounced in scope and severity” than those of other U.S. allies, and described an alliance “highly strained and losing trust.” The U.S. State Department declined to comment, and the White House didn’t respond to a request for comment. An official at South Korea’s presidential office said the government was working to strengthen trust with the United States and called the alliance the cornerstone of Seoul’s foreign and security policy. South Korea’s National Intelligence Service didn’t respond to calls for comment.

Former Vice President Kamala Harris, speaking in Seoul on Wednesday, criticized Trump for cutting drills and using tariffs to threaten partner nations. “Changing circumstances require a renewal of our commitment to South Korea,” she said. “America must be strategic in the use of its economic power, not reckless or spiteful.”