A single sentence uttered in the National Assembly of South Korea has laid bare just how fragile the architecture of the South Korea-U.S. intelligence relationship can be, and how detached from reality the cornerstone of Washington’s North Korea policy has become.

On March 6, Unification Minister Chung Dong-young named Kusong, North Pyongan Province, as the location of a third uranium enrichment facility in North Korea. It was the first time a senior South Korean government official had publicly identified the city by name. Within weeks, Washington had restricted the sharing of satellite-derived North Korea intelligence with Seoul. Some observers in Seoul believe that Chung’s remarks were responsible – and could be affecting South Korea-U.S. defense cooperation more broadly.

The main opposition People Power Party called for Chung’s immediate dismissal, framing the incident as a catastrophic intelligence breach. On April 20, South Korean President Lee Jae-myung pushed back on X (formerly Twitter), arguing that the existence of a nuclear facility in Kusong had already been widely reported and that the characterization of Chung’s remarks as a leak of classified U.S. intelligence was flatly wrong.

The Unification Ministry has been explicit that Chung’s reference to Kusong drew not on classified briefings from U.S. or South Korean intelligence agencies, but on open-source material, including a 2016 report by the Institute for Science and International Security (ISIS) that identified a uranium enrichment-related facility near Panghyon Air Base. Chung himself stated that he had received no intelligence briefings on nuclear facilities since taking office. The Unification Ministry confirmed that no information related to Kusong was provided by any other agency.

Critically, Chung had made essentially the same remarks at his confirmation hearing in July 2025 without triggering any reaction from Washington. If the information was genuinely sensitive enough to warrant a cutoff of intelligence sharing, the threshold for that response was applied inconsistently and retroactively.

South Korean Defense Minister Ahn Gyu-back told lawmakers that no formal protest from U.S. Forces Korea Commander General Xavier Brunson had been delivered to his ministry. He also agreed that Chung’s remarks could not reasonably be characterized as a disclosure of classified material, given how widely the underlying information had already been published.

More to the point, South Korea does not rely solely on the United States for intelligence on North Korea. Its own National Intelligence Service, military surveillance assets, and a network of international intelligence-sharing partners provide independent streams of information. The assumption embedded in Washington’s response that any South Korean knowledge about Kusong must have originated from the U.S.-provided intelligence reflects either a misreading of Seoul’s independent capabilities or a deliberate effort to exert pressure for other reasons.

Long before Chung named Kusong, the U.S. itself had publicly acknowledged that North Korea’s nuclear infrastructure extended well beyond Yongbyon. At his press conference after the February 2019 Hanoi summit collapsed, U.S. President Donald Trump said North Korea had been surprised that the United States knew about an additional uranium enrichment site. 

The reason Trump walked away from Hanoi was precisely that North Korean leader Kim Jong Un’s offer – full dismantlement of the Yongbyon complex in exchange for broad sanctions relief – was insufficient. Yongbyon was not the whole program and the summit’s breakdown centered around a public disclosure that covert uranium enrichment sites existed and that the U.S. had them in its crosshairs. In that context, the notion that Chung’s reference to Kusong seven years later constitutes a damaging revelation of previously hidden information is difficult to sustain.

The Kusong episode is, in the end, a sideshow. The more consequential question it raises is the one neither Washington nor Seoul’s conservative bloc wants to answer directly: Is North Korean denuclearization actually achievable? The answer is clearly no.

Why Denuclearization Is Not Coming

Since the Hanoi breakdown, Kim Jong Un has been unambiguous: North Korea’s nuclear arsenal is no longer up for negotiation. In September 2022, Pyongyang passed a law codifying the conditions for nuclear weapons use, including potential first use, and declaring the country’s nuclear status “irreversible.” In September 2023, North Korea enshrined its nuclear force-building policy in the constitution itself, making nuclear possession the basic law of the state. In a speech to North Korea’s parliament in March 2026, Kim reaffirmed his intention to continue to consolidate his country’s nuclear deterrent absolutely.

The strategic logic driving these decisions is not hard to follow. Recent international developments have reinforced for Pyongyang what it has long believed: that nuclear weapons are the only reliable guarantee of regime survival. Russia’s invasion of Ukraine in 2022 demonstrated that a country that surrendered its nuclear arsenal in exchange for security assurances, as Ukraine did under the 1994 Budapest Memorandum, can find those assurances worthless when a great power decides to act. And the ongoing Israel-U.S. conflict with Iran has shown that being a non-nuclear regional power in confrontation with the United States carries enormous military risk.

For Kim, the lesson is clear: a nuclear-free North Korea would be militarily exposed. With a dysfunctional economy, almost total dependence on Chinese trade and Russian political cover, and no conventional military capability remotely capable of deterring a South Korean-U.S. combined force, there is no way Pyongyang can guarantee its self-defense without nuclear weapons. 

The structural environment reinforces this calculus. A new cold war architecture has solidified in Northeast Asia: the Japan-South Korea-U.S. trilateral on one side, the China-North Korea-Russia alignment on the other. China and Russia, both permanent members of the United Nations Security Council, have effectively neutered sanctions enforcement in the past years. Moscow also revealed its view that the denuclearization of North Korea is a dead issue. China-North Korea trade has expanded even as Western sanctions nominally remain in force. The urgent need Pyongyang once felt to escape economic pressure has been substantially diluted – and with it, North Korea’s main motivation to bargain over its nuclear program.

In practical terms, North Korea has amassed an estimated 50 assembled nuclear warheads, with enough fissile material for 40 to 50 more. Its missile program now includes solid-fuel intercontinental-range ballistic missiles (ICBMs) capable of reaching the U.S. mainland, hypersonic glide vehicles, and tactical nuclear-armed short-range systems designed to overwhelm South Korean and Japanese defenses. The arsenal that existed in 2019 has since grown dramatically in both quantity and sophistication. Time is not on Seoul’s or Washington’s side.

What Are the Realistic Diplomatic Options?

Victor Cha, Korea Chair at the Center for Strategic and International Studies and one of Washington’s most prominent North Korea hawks, argued in Foreign Affairs on April 21 that three decades of U.S. policy built around complete, verifiable, irreversible denuclearization have demonstrably failed. Instead, Cha said that the United States must begin building what he calls a “cold peace” –  managing North Korea as a nuclear-armed state while pursuing crisis stability, arms control, and direct communication channels rather than insisting on disarmament as the precondition for any engagement.

Cha’s framing is more realistic than anything currently emanating from official Washington. However, it does not go far enough.

The Lee administration’s position is that the window for meaningful diplomacy is narrowing rapidly. Every year that passes without engagement produces a more geographically dispersed North Korean nuclear program. The negotiating leverage the United States and South Korea hold today is greater than what they will hold years from now.

In light of North Korea’s continuous nuclear development, an agreement to halt further missile development, cap fissile material production, and open some form of direct communication channel would be a meaningful first step. Framing such an agreement as “arms control” rather than “denuclearization” would be accurate and would not require Washington to formally recognize North Korea as a nuclear state.

Some in Washington will resist this framing, arguing that any arrangement short of full denuclearization implicitly legitimizes Kim’s arsenal. That argument mistakes symbolism for strategy. The arsenal is real regardless of what Washington calls it. The question is whether the United States and its allies manage the risk it poses, or whether they continue to demand an outcome that North Korea has constitutionally prohibited itself from accepting.

As every serious observer knows, Kim Jong Un will not give up his nuclear weapons. Economic inducements matter less and less as China and Russia blunt the impact of sanctions. Security guarantees have little value when Kim has watched the United States walk away from similar guarantees before. The precondition for any change in Pyongyang’s calculus would be a transformation of North Korea’s economy to something approaching the scale of Vietnam or Indonesia. And such a transformation can only begin through diplomatic normalization with the broader international community.  

Until that foundation exists, denuclearization is not a policy goal but a wish. And with that reality in mind, the controversy over Chung’s reference to Kusong is akin to fiddling while Rome burned.