Korea cannot afford to sit out Hormuz mission

Chun In-bum

The Strait of Hormuz is not a distant geopolitical concern for South Korea. It is a direct artery of national survival — economically, industrially and strategically. Approximately 60 percent of South Korea’s crude oil imports transit this narrow waterway. This is not an abstract vulnerability, it is a structural dependency. Any sustained disruption in Hormuz would immediately impact energy prices, industrial output and ultimately national stability.

Despite this reality, South Korea’s posture toward the evolving situation in the Middle East remains cautious, even hesitant. That caution is understandable — but it is no longer sufficient.

Iran, particularly through the Islamic Revolutionary Guard Corps, has not limited itself to rhetoric. It has a documented history of interfering with maritime traffic in the strait. These actions include the seizure of commercial vessels, harassment of tankers and the use of drones and fast attack craft to signal coercive intent. While a full blockade of the strait is widely assessed by military analysts as extremely difficult— bordering on infeasible due to U.S. and allied naval dominance — this does not mean Iran lacks effective options.

Disruption, not closure, is the real threat.

Even limited interference — sporadic seizures, mining threats or drone attacks — can have outsized economic effects. The global oil market is highly sensitive to perceived risk. Insurance premiums spike, shipping routes adjust and prices rise rapidly. In this sense, Iran does not need to win a naval confrontation to achieve strategic impact. It only needs to create uncertainty.

That uncertainty is already enough to ripple through the global economy and South Korea, as a trade-dependent, energy-importing nation, sits near the front of that impact zone.

Against this backdrop, the question is no longer whether Korea is affected. It already is. The real question is whether Korea will act proportionately to its interests.

The United States has called for allied support in maintaining freedom of navigation in the region. While the exact scope and form of that support may vary, the strategic intent is clear: burden-sharing among allies to ensure the continued flow of commerce through one of the world’s most critical maritime chokepoints.

For South Korea, this presents both an opportunity and a dilemma.

The opportunity lies in reinforcing its position as a credible security partner within the alliance framework. South Korea has already demonstrated its ability to contribute to maritime security through operations such as the Cheonghae Unit deployments in the Gulf of Aden. These missions have built operational experience, interoperability with U.S. forces and international credibility.

The dilemma, however, centers on legal and strategic ambiguity. The mutual defense treaty between South Korea and the U.S. is primarily structured around the defense of the Korean Peninsula. Its applicability to operations in the Strait of Hormuz is not explicit. Any deployment tied directly to U.S. requests could therefore raise political and legal questions domestically: Is this alliance obligation or discretionary participation?

That debate, while valid, risks missing the larger point. South Korea does not need treaty justification to protect its own national interests. The core issue is not whether the mutual defense treaty applies. The core issue is whether South Korea is willing to secure the maritime lifelines upon which its economy depends.

From a purely national perspective, the logic is straightforward. South Korean-flagged vessels, Korean energy imports and Korean commercial interests transit the strait daily. Ensuring their safe passage is not alliance politics — it is sovereign responsibility.

This leads to a practical conclusion: South Korea should deploy naval assets with a clearly defined national mission — protection of Korean shipping and citizens.

Such a deployment does not require participation in offensive operations, nor does it necessitate full integration into U.S.-led task forces, although coordination would be operationally prudent. Instead, it can be framed as a defensive, limited and rules-based mission focused on escort, surveillance and rapid response.

There is precedent for this approach. Many nations operating in high-risk maritime zones maintain independent or semi-coordinated deployments that prioritize national assets while contributing to broader stability. South Korea can adopt a similar model — one that balances autonomy with alliance cooperation.

Critically, this approach also mitigates escalation risk. By clearly defining the mission as defensive and narrowly scoped, South Korea reduces the likelihood of being drawn into broader regional conflict while still protecting its interests.

The alternative — non-participation — carries its own risks. Failure to act would leave Korean shipping reliant entirely on the security guarantees of others. While U.S. naval power remains the dominant stabilizing force in the region, over-reliance without contribution weakens alliance credibility over time. Burden-sharing is not merely a political slogan, it is a strategic expectation.

Moreover, passivity does not insulate South Korea from consequences. If disruption escalates and oil flows are constrained, South Korea will face the same economic shock regardless of whether it contributed to securing the strait.

In strategic terms, this is a classic case of exposure without influence. By choosing not to act, South Korea forfeits the ability to shape outcomes while remaining fully vulnerable to them.

There is also a broader issue at stake. South Korea has emerged as a major global trading nation and an increasingly capable maritime power. Its defense industry exports, naval modernization and blue-water ambitions all point toward a more outward-facing security role. The Strait of Hormuz represents a real-world test of that role.

Capability, if not exercised, is merely potential.

A measured deployment would demonstrate that South Korea is prepared to align its actions with its interests. It would reinforce alliance credibility, protect national assets and contribute to the stability of a critical global commons — all without overextension.

To be clear, this is not a call for adventurism. The risks are real. Iranian asymmetric capabilities — mines, drones and fast attack craft — pose credible threats even to advanced navies. Rules of engagement must be carefully defined. Command and control structures must be clear. Political oversight must be maintained. But these are manageable risks — far more manageable than the systemic risk of inaction.

In the final analysis, the Strait of Hormuz is not someone else’s problem. It is Korea’s problem — economically immediate, strategically significant and operationally addressable.

South Korea does not need to choose between alliance obligations and national interests. In this case, they align.

The question is whether Seoul is prepared to act accordingly.

If Korea intends to protect its economy, its shipping and its strategic credibility, then the answer is not complicated.

It needs to move its ships.

Retired Lt. Gen. Chun In-bum is the former commander of the Republic of Korea Army Special Warfare Command.