This marked the collapse of a decade-long diplomatic agreement that once promised to restrain Iran’s nuclear program in exchange for sanctions relief. The re-imposition of UN sanctions on Iran through the JCPOA snapback mechanism underscores not only Iran’s isolation, but also the failure of Western diplomacy. By abandoning reciprocity, relying on coercion, and aligning with Washington’s “maximum pressure” strategy, European powers not only eroded trust but also exposed their inability to sustain credible agreements, making sanctions a symbol of diplomatic defeat rather than success.

The roots of Iran’s sanctions regime date back to 2005 when the International Atomic Energy Agency (IAEA) declared Iran non-compliant with its safeguard obligations. In 2006, the UN Security Council unanimously approved sanctions restricting uranium enrichment materials, missile technology, and related financial transactions. Successive resolutions in 2007 and 2008 further tightened the restrictions. In 2010, sanctions were expanded to target Iran’s oil revenues and banking sector, linking them directly to proliferation concerns.

These sanctions were lifted under the JCPOA in 2015, an agreement between Iran and world powers. The agreement also included a snapback clause; if Iran violated its obligations, any party to the agreement can activate the snapback mechanism and re-impose sanctions before the expiration date of the JCPOA on October 18, 2025. On August 28, 2025, after repeatedly accusing Iran of non-compliance, the E3 (France, Germany, and the UK) activated the snapback mechanism that will re-impose UNSC sanctions on Iran after a 30-day time period.

The snapback that went into effect on September 28, 2025, reinstates UNSC sanctions, originally imposed 2006–2010. These sanctions include an arms embargo, ban on ballistic missile technology transfers, and restrictions on oil revenues and financial services—including Iran’s central bank. This decision aligns Europe more closely with the American position, despite Washington having withdrawn from the JCPOA in 2018. However, the sanctions are not binding on China and Russia, and both remain aligned with Iran and critical of the European move.

Iranian President Masoud Pezeshkian condemned the sanctions as “unfair, unjust, and illegal.” Tehran recalled its ambassadors from the United Kingdom, France, and Germany for consultations but clarified it had no immediate plans to withdraw from the Nuclear Non-Proliferation Treaty (NPT). Any further response, however, will likely be determined by the Iranian parliament.

The JCPOA was built on reciprocity and trust, but after the US withdrew, Europe failed to deliver promised economic benefits. Instead, Iran faced escalating accusations and even sabotage.

Coordinated attacks by the US and Israel in June 2025 on Iran’s nuclear facilities during negotiations eroded any remaining trust in Western intentions. Today, Iranian officials view Western diplomacy less as a pathway to compromise and more as a tool for coercion and deception.

While Russia and China echoed Iran’s position and warned that the European move would fuel further instability in the region, the E3 maintained that Iran’s nuclear activity crossed red lines. E3 members also emphasized that diplomacy was not over by offering to delay sanctions for six months if Iran restored access for inspectors and engaged in talks with the US.

The reactivation of sanctions primarily reflects Europe’s failure to secure diplomatic gains after the 12-day war earlier this year. Western powers assumed Iran’s weakened position, given that internal unrest, economic strain, and military pressure would push it toward compromise. Instead, Iran resisted demands for zero enrichment and even presented partial solutions at the UN, which were rejected. The E3’s alignment with Washington now resembles Trump’s “maximum pressure” strategy, raising the risk of further escalation rather than resolution.

Nevertheless, the first brunt of these sanctions will fall on ordinary Iranians. Currency devaluation, unemployment, and economic stagnation will intensify along with the hardships caused by protests and war. The Iranian banking sector, already fragile, faces further isolation. Yet for Iran’s leadership, these sanctions may not dramatically alter strategic calculations. Having endured American sanctions since 2018, Tehran has adapted by relying increasingly on its Look East strategy to deepen economic and diplomatic ties with China and Russia.

The energy sector will again come under strain, but much depends on how aggressively the US enforces secondary sanctions, particularly against China, one of Iran’s largest oil buyers. If oil exports continue through alternative routes, Iran will remain financially afloat, albeit constrained. Thus, the sanctions are more likely to weaken Iran internally while leaving its external policies largely intact.

Perhaps the most dangerous consequence of the snapback is the possibility of renewed Israeli strikes against Iran’s nuclear infrastructure. In June 2025, Israel used IAEA findings as justification for bombing Iranian facilities, sparking a costly 12-day conflict. Israel could again resume attack under the guise of re-imposition of UNSC sanctions.

The attacks stalled Iran’s nuclear program by roughly two years, thus dragging the US into a wider regional confrontation with little strategic gain. By contrast, the JCPOA achieved restrictions on Iran’s nuclear program without military confrontation and provided economic benefits and political openings for both sides. It shows that diplomacy slows proliferation more effectively and cheaply than war. Yet with sanctions restored, Israel may once again seek a military solution, raising the risk of escalation across the region.

The re-imposition of UN sanctions through the snapback mechanism signals both the collapse of trust in the JCPOA framework and the deepening rift between Iran and the West. For Iran, the sanctions reinforce the perception that Western promises are unreliable, and diplomacy is a trap.

For Europe, the move highlights its limited influence, as it increasingly gravitates toward Washington’s approach rather than pursuing independent solutions. Ultimately, sanctions will punish ordinary Iranians more than they will alter Tehran’s strategic direction. With China and Russia unlikely to comply, Iran’s external lifelines remain intact. What has been lost, however, is the fragile trust built over a decade of negotiations.

The JCPOA demonstrated that diplomacy could restrain Iran’s nuclear ambitions without war; the snapback demonstrates how easily that progress is undone. As tensions rise, the international community faces a choice, either double down on coercion or return to diplomacy. The lesson of the past decade is unmistakable: military and economic pressure may delay Iran’s nuclear program, but only diplomacy can stop it.

Sidra Shaukat is a Research Officer at SVI. Views expressed in this article are the author’s own.

Snapback Sanctions: The Collapse of Western Diplomacy with Iran was originally published on Global Security Review.

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.

It was not until June 6, 1944, four years later, that the allies landed on the Normandy coast. Over 200,000 troops, in a 48-hour period, in the largest amphibious operation in history, stormed the beaches to do what the Germans thought impossible. Eight months later, Germany was defeated.

The cost was high, however. With the German Army facing little opposition in the Rhineland, Austria, or Czechoslovakia, the German invasion West into the low countries and France was easy. Western Europe fell in a matter of three months from April to June 1940. At the end of the day, once deterrence was lost, World War II led to the death of over 60 million people. Getting deterrence back was a tough proposition.

In 1949, the United States withdrew its military from the Republic of Korea. Then, in January 1950, the US Secretary of State, Dean Acheson, asserted that the Republic of Korea (ROK) was beyond the US defense perimeter. In early June, the US Congress approved an aid package for the ROK, but it was not delivered until after the North Korean invasion that began on June 25, 1950. Undermining American deterrence of North Korea with Acheson’s speech ultimately cost 2 million Korean lives and nearly 200,000 allied casualties.

Although the US was able to reestablish deterrence in Korea seven decades later, in 2014, the United States lost effective deterrence once again—this time in Europe. That was the year Washington declared that Ukraine was not of interest to the United States, leaving Ukraine to the tender mercies of the Russian Army. Russia soon took Crimea and ultimately launched a brutal invasion in 2022.

In 2021, the US withdrew ignobly from Afghanistan, further signaling the nation’s enemies that the US was not in the deterrence business. The consequences of that act are still unknown.

Later in 2021, the administration hesitated in making it clear whether Washington would or would not defend Ukraine from further Russian aggression. Though the mistake was later rectified, the damage to deterrence was done.

Further harm came to Ukraine, the US, and the North Atlantic Treaty Organization’s (NATO) European member states when it became clear Washington was fearful of a Russian escalation of the conflict should the allies get serious about pushing back against Russian aggression. Russian President Vladimir Putin repeatedly threatened the use of nuclear weapons should Ukraine and the allied coalition get serious about rolling back Russia’s aggression—the successful use of Russian deterrence.

To counter the American loss of deterrence, Congress agreed to markedly increase defense spending and investments in America’s nuclear deterrent, space capability, and missile defense. Over time, and coupled with a sense of urgency, the United States can restore deterrence if these new investments are sustained.

The nation’s legacy nuclear deterrent, which is now between 35 to 65 years old, will soon age to obsolescence. The Sentinel intercontinental ballistic missile (ICBM), Columbia-class ballistic missile submarine (SSBN), and the B21 Raider strategic bomber, along with the long-range nuclear cruise missile, once built, will markedly restore nuclear deterrence. An improved theater nuclear deterrent, with a new sea-launched nuclear cruise missile and a stand-off nuclear capability for the F-35, would also significantly improve deterrence.

These systems give the nation the capability required to deter China and Russia. However, the second part of deterrence is will. Whether the United States has the will to employ its deterrent capability is uncertain.

How the administration handles Iran will say a great deal about how adversaries see American will. The administration is committed to preventing Iran from getting a nuclear weapon. Washington said you could do this the easy way or the hard way. A negotiated deal is one way but military strikes on Iran’s nuclear infrastructure is the other.

With the Israelis and Americans on the same page and the war already begun, the die is now cast and the US does not have endless patience. But whether it is willing to use military force is uncertain. Although Henry Kissinger once said that diplomacy without the threat of force is without effect, the conventional wisdom in Washington is that no military action will be forthcoming.

The Trump administration carefully laid out a challenge to the Iranians. There were 60 days for negotiations. Now, it is widely known that on day 61 the Israelis, with US missile and air defense assistance, took out most of the above ground Iranian nuclear capability as well as the top Iranian nuclear leadership.

Perhaps Israeli deterrence credibility was restored, but whether that is true of the United States is far less certain. The Trump administration did what it said it would do. The Israelis did what they had to do. Both nations did what was necessary to restore deterrence. The Iranian nuclear capability is gone. How this will affect Chinese and Russian aggression, that requires more insight.

Peter Huessy is a Senior Fellow at the National Institute for Deterrence Studies.

Restoring Deterrence was originally published on Global Security Review.