Lessons Korea should learn from Iran
A person holds a placard with a picture of Iran's Supreme Leader Ayatollah Ali Khamenei in Sanaa, Yemen, March 1, at a protest against Israel and the U.S. strikes on Iran, following the killing of Ali Khamenei. Reuters-Yonhap
Chun In-bum
What is unfolding between the United States, Israel and Iran is not a distant geopolitical drama. It is a case study in what happens when a regime repeatedly tests international limits and assumes consequences will never arrive.
For years, Iran advanced its nuclear ambitions, armed regional proxies, threatened American interests and suppressed internal dissent. Each move was calculated. Each escalation was measured. But cumulative defiance narrows diplomatic space. Strategic patience eventually expires.
Pyongyang is watching this carefully.
There are clear parallels between Iran and North Korea. Both rely on missiles, coercive rhetoric and calibrated escalation to compensate for economic and conventional weakness. Both view nuclear capability as regime insurance. Both assume that external actors will ultimately avoid confrontation due to escalation risks.
The difference is that North Korea already possesses nuclear weapons. That reality does not guarantee safety. It merely raises the stakes.
The true stabilizing factor on the Korean Peninsula is not North Korea’s arsenal. It is the alliance structure anchored by South Korea, Japan and the United States. That structure imposes strategic restraint on all sides because any conflict would be immediate, catastrophic and alliance-driven.
But restraint depends on credibility.
Here is the uncomfortable point the Korean public must confront: the U.S.-ROK alliance is not indestructible. It is sustained by political will on both sides. If South Korea signals that the alliance is conditional, negotiable or politically expendable, Washington will not ignore that signal.
Great powers adjust. They always do.
Some in South Korea believe the alliance can be strategically “tested” — that Seoul can publicly distance itself from Washington, question joint exercises, dilute trilateral cooperation with Japan and still assume the American security guarantee remains unchanged. That is a dangerous illusion.
Security guarantees are strongest when they are unquestioned. The moment they become subject to domestic political bargaining, adversaries notice.
If Seoul appears divided or ambivalent, Pyongyang will exploit it. Not necessarily through invasion, but through calibrated pressure: missile demonstrations, cyber operations, political wedge tactics, escalatory signaling designed to measure alliance cohesion.
If Washington perceives hesitation in Seoul, it will hedge. Hedging does not require abandonment. It requires adjustment — force posture changes, prioritization shifts, conditional commitments. And once strategic recalibration begins, it is rarely reversed quickly.
The first costs of miscalculation will not fall on Washington. They will fall on Seoul.
Progressives who advocate engagement with North Korea are not wrong to seek reduced tension. Dialogue is necessary. But dialogue that undermines deterrence credibility invites coercion. There is no historical example in which weakening alliance solidarity strengthened negotiating leverage with a nuclear-armed adversary.
Strategic autonomy is often invoked as justification for recalibrating ties with the United States. But autonomy without substitute capability is exposure. China will not defend South Korea against Northern aggression. Japan cannot replace American extended deterrence. An independent nuclear option would impose severe economic and diplomatic penalties on South Korea.
These are not ideological statements. They are structural realities.
The global security environment is tightening. Major power competition is intensifying. The tolerance for prolonged nuclear brinkmanship is shrinking. If Iran’s experience teaches anything, it is that regimes which assume escalation control indefinitely may eventually discover limits they misjudged.
North Korea will draw its conclusions. The Korean public must draw its own.
Testing the alliance for domestic political leverage is not strategic sophistication. It is strategic gambling in an increasingly unforgiving environment.
Peace on the peninsula has not endured because threats disappeared. It has endured because deterrence was credible and alliances were solid. Undermining those pillars in pursuit of tactical political gains risks weakening the very structure that prevents war.
Korea faces hard choices. They will require discipline, realism and unity. Pretending that the alliance can be safely diluted without consequence is not prudence. It is denial.
In a volatile era, denial is costly.
Retired Lt. Gen. Chun In-bum is the former commander of the Republic of Korea Army Special Warfare Command.