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.