The near completion of Iran’s nuclear weapon brings to mind another rogue state’s activities. In 2006, after years of global efforts aimed at preventing the Kim regime from obtaining nuclear weapons, North Korea (DPRK) conducted its first nuclear test. Today, the DPRK has an estimated 50 nuclear weapons and fissile material for 6 or 7 more.

An in-depth comparison of US engagement with Iran and the DPRK’s nuclear programs requires a much longer paper. However, a brief comparative analysis of American deterrence of these adversaries is possible. Applying national interests, objectives, and activities, a methodology employed by decision analysis experts yields interesting results.

Globally, the United States has an enduring interest in safeguarding its national security and sovereignty. Underneath this enduring interest, it has a core objective of defending allies and partners, including through credible deterrence (e.g., preventing conventional and/or nuclear attacks on allies and partners by the DPRK, China, Russia, and Iran). Other major American objectives include safeguarding the free flow of commerce, countering transnational threats, preventing regional domination or aggression, and advancing nonproliferation.

The United States advances deterrence through a range of activities, including the presence of its own military assets and security cooperation with allies and partners. In the Indo-Pacific, this includes mutual defense treaties with Australia, the Philippines; South Korea, and Japan (the latter two of which are explicitly covered by the US nuclear umbrella); arms sales to Taiwan; and military exercises with allies.

More recently, the Trump administration emphasized increased allied defense spending to support “burden-sharing.” Given the limitations of the American industrial base, this is necessary even as the US maintains efforts to prevent Chinese and North Korean aggression.

Deterrence against North Korea is successful insofar as it keeps the North from invading the South or launching nuclear strikes on US Indo-Pacific allies. However, this deterrence is increasingly complicated by Chinese and Russian protection of the DPRK through mutual defense treaties.

This lends greater urgency to the American call for allies to increase defense spending, as there is a real risk of simultaneous conflict with China and North Korea, a scenario requiring substantial military assets in the region. Fulfilling the objective of regional deterrence also requires containing aggression from adversaries and bolstering security cooperation with allies and partners.

The United States supports deterrence in the Middle East by deploying its military forces and cooperating with allies and partners. However, regional deterrence, which does not formally extend the US nuclear umbrella to regional allies and partners (including Israel), often manifests as kinetic operations against adversaries, whether through security assistance or direct attacks. Thus, in the Middle East, deterrence also means advancing the goals of counter proliferation and degrading terror groups who threaten allies.

Unlike in the Indo-Pacific, where the United States prefers to contain aggression and expansion from nuclear-armed adversaries without firing a shot, in the Middle East, it will employ kinetic means to fulfill its objectives. For decades, the United States deterred Iran through sanctions, negotiations, and the threat of military action. It was when President Trump believed Iran’s uranium enrichment program was “at its highest levels and…unprecedented for a state without nuclear weapons” that the US conducted kinetic attack.

The deep rifts in Middle East politics complicates the activities needed to maintain deterrence in the region. Prospects for security cooperation between Israel and the Gulf states, for example, are challenging given the history of the Arab-Israeli conflict, including Israel’s recent strike against Hamas in Qatar.

Deterrence must also account for energy security concerns, given that US attempts to contain a nuclear-armed Iran may lead the regime to weaponize its control over the Straits of Hormuz. It is also unclear how far back American strikes set Iran’s nuclear program. If Iran’s proxy network persists, they can also commit further violence against the United States, its allies, and partners through attacks on military, commercial, and civilian targets.

None of these challenges are simple. In the coming years American deterrence guarantees to allies and partners may look very different as the nation shifts focus to the homeland and the Indo-Pacific. It remains to be seen how this imperative is realized in the forthcoming National Defense Strategy. Some critics note that, in practice, the United States remains heavily focused on the Middle East and Europe. Much of the ability to deter Iran and North Korea will be determined by these larger strategic shifts.

As American decision-makers face questions about effectively deploying American power across the globe, analyzing national interests, objectives, and activities can provide a helpful framework. Assessing the requirements needed to advance larger regional goals brings trade-offs into focus, better preparing the American warfighter for multiple threat scenarios. In short, this approach can yield meaningful results for those in the decision-making chair at critical moments when faced with complex problems, including maintaining credible deterrence.

Nathan Heath is an analyst at NSI. Views expressed are his own.

Deterrence of North Korea and Iran: Interests-Objectives-Analysis Framework was originally published on Global Security Review.

The Democratic People’s Republic of North Korea (DPRK) tested its first nuclear device on October 9, 2006. This action exacerbated an already significant threat perception by the Republic of Korea (ROK) and Japan. Because of the United States’ treaty agreement concerning the defense of South Korea and Japan, both nations, while uneasy, were confident in American security guarantees. In the subsequent two decades, the North Korean threat has grown considerably as has the China threat.

On December 18, 2023, the Associated Press reported that “North Korea on Monday conducted its first intercontinental ballistic missile test in five months, likely launching a developmental, more agile weapon, as it vows strong responses against US and South Korean moves to boost their nuclear deterrence plans.” The DPRK tested the Hwasong-18 ICBM. Theodore Postol argues that the Hwasong-18 is “identical” to the Russian Topol-M (SS-27 Mod 2). Jacob Gleason describes the Topol-M as having a range of 10,500–12,000 kilometers. The ranges of the Topol-M and DPRK’s Hwasong-18 are similar. According to Ridzwan Rahmat, the “Hwasong-18 is deployed onboard a nine-axled transporter-erector-launcher (TEL).”

Rahmat suggests that the Hwasong-18 is possibly equipped with multiple independently targetable re-entry vehicles (MIRV), which enhances its strategic military posture by enabling a singular missile launch to engage multiple targets concurrently. Drawing on the framework posited by Postol, which draws a parallel between the SS-27 and the Hwasong-18, it is plausible, to infer that the Hwasong-18 missile may have the capacity to carry up to four nuclear warheads.

In the context of North Korea’s growing missile capabilities, it is imperative to formulate a strategic response that effectively deters Kim Jong Un from engaging in provocations that might threaten the United States, South Korea, or Japan. Within this intricate security landscape, the United States is responsible for reinforcing and validating the trust of regional allies, specifically the ROK and Japan.

Regarding the American commitment to South Korea, the Department of Defense provides insights that emphasize the necessity of a robust and unwavering alliance framework to ensure regional stability and counter the threats posed by the DPRK’s military advancements. This necessitates a nuanced approach that balances deterrence with diplomatic engagement, thereby maintaining regional peace and security while upholding the integrity of international alliances.

As the Department of Defense recently reminded Americans, “In 1953 the United States and Republic of Korea (ROK) signed the Mutual Defense Treaty pledging to promote peace, defend against external threats, and strengthen collective defense in the Pacific region. Seventy years later, the U.S.-ROK Alliance now stands as one of the world’s premier alliances.” This is a clear statement of commitment to the alliance with South Korea. To comply with the “defend against external threats” directive, the United States needs to change its nuclear policy toward North Korea.

The Treaty of Mutual Cooperation and Security Between Japan and the United States, Article III states, “The Parties, individually and in cooperation with each other, by means of continuous and effective self-help and mutual aid will maintain and develop, subject to their constitutional provisions, their capacities to resist armed attack.” These agreements codify an American commitment to the ROK and Japan.

If either South Korea or Japan lost faith in American commitment to their security, both countries have the technical capacity to pursue their own nuclear arsenals to deter the DPRK. To prevent such an eventuality, the United States, under the auspices of the Washington Declaration, is actively expanding its assurance efforts. The success of American efforts is evinced in the South Korea announcement: “The United States and South Korea plan to draw up joint guidelines on nuclear defense strategy by the middle of next year and establish an integrated system to deter North Korea’s nuclear weapons, Yonhap news agency said on Saturday.”

For American assurance efforts to work long term, the United States must explore multiple options to mitigate the potential security threats posed by North Korea. First, the US must continue support for joint exercises, like Ulchi Freedom Shield, but also consider including greater employment of nuclear weapons. The message conveyed through exercises is simple—the US and ROK alliance is prepared, through practice, for conflict.

Second, the United States should rotationally deploy nuclear weapons on the Korean Peninsula. This will signal North Korea that the United States is deeply committed to South Korean security. However, this strategy requires cautious execution to avoid provoking China, which could lead to unintended consequences.

Third, the United States could also undertake a continuous deployment of nuclear weapons on the Korean Peninsula. They were in South Korea for decades and widely accepted by South Koreans. Nuclear weapons would be more welcome today given North Korean nuclear pursuits.

China is certain to respond negatively to any of these options, as would North Korea. However, the consequence of doing nothing may produce a situation that allows the DPRK to push the escalation rhetoric and provocations to the point of conflict.

North Korea’s growing nuclear arsenal and China’s nuclear breakout are increasingly concerning for South Korea and Japan as both nations see these efforts as a clear threat to their own security. American commitment to the ROK and Japan remains on shaky ground, despite the positive steps taken since the Washington Declaration. Countering those threats with a very clear commitment of American nuclear weapons may prove just the right demonstration of commitment to friend and foe alike.

James M. Ragland is a Fellow at the National Institute for Deterrence Studies. The views expressed in this article are the author’s own.

The North Korean Missile Threat was originally published on Global Security Review.