The failure of the U.S.-Iran negotiations that took place in Pakistan marks a decisive inflection point in the current Middle Eastern security course. This is not a diplomatic setback; it is the transition from a fragile de-escalation phase into a more volatile period defined by coercive pressure, military signaling, and elevated risk of miscalculation. This risk is driven by the threat Iran continues to pose to freedom of navigation in the Strait of Hormuz and by its remaining ballistic capabilities, which allow it to erratically target neighboring Arab states and regional U.S. allies.

Furthermore, the announcement of a U.S.-led maritime blockade over Iranian ports fundamentally alters the operational and strategic landscape aimed at confining the Iranian threat. The main question now is no longer whether tensions will rise, they already have, but whether the current trajectory leads toward controlled escalation, negotiated recalibration, or systemic full-scale conflict.

Structural Drivers of Escalation

At the core of the U.S.-Iran negotiations lies a set of structural but irreconcilable objectives. The U.S. continues to frame its demands around three pillars: curtailment of Iran’s nuclear development program, limitations on ballistic missile capabilities development, and the rollback of Iran’s regional proxy networks. Iran, on the opposite side, views these elements as essential to regime survival and sovereign deterrence. Accordingly, this is not a negotiation gap; it is a strategic contradiction.

Iran’s nuclear posture has evolved from a bargaining chip into a core pillar of the Iran’s Islamic Revolutionary Guard Corps’ (IRGC) and the regime’s survival. Any perceived concession risks undermining internal legitimacy and external deterrence credibility. Accordingly, ongoing diplomatic negotiations are performative rather than transformative, thus aimed at managing escalation rather than resolving underlying disputes. Additionally, the U.S. decision to impose a maritime blockade represents a calibrated escalation designed to exert economic and psychological pressure without the need to immediately resort back to kinetic operations. However, the strategic implications are profound.

Iran’s economy relies mainly on maritime oil exports. A blockade directly targets this vulnerability, threatening revenue streams, which then impacts the domestic stability, in addition to regional influence operations funded through such revenues. From Tehran’s perspective, failure to respond would signal weakness not only to the U.S. but also to its network of non-state groups across the region. This creates a classic escalation dilemma for Iran. On one hand, not responding risks strategic erosion of the IRGC and the current regime’s image. On the other hand, the response risks triggering military confrontation, which Iran cannot withstand. In such conditions, even any Iranian action such as harassment of commercial shipping, or proxy attacks carry a high probability of escalation.

Another key driver for the escalation is the pre-positioned military capabilities. Unlike previous crises, the current environment is characterized by pre-positioned military assets and operational readiness on both sides. U.S. naval, air, and ground forces in the Middle East are already configured for rapid response operations, while Iran’s IRGC maintains asymmetric capabilities are carefully tailored for maritime disruption, drone attacks, ballistic missile launches, and regional proxy warfare.

Regional Spillover Risks

The Strait of Hormuz remains the most critical geographic variable in this confrontational equation given that one-fifth of global oil trade passes through this narrow waterway. Iran has long signaled its capability and strategic intent to disrupt traffic through asymmetric means, including naval mines, drones, and anti-ship missiles. While full closure remains unlikely due to the overwhelming U.S. response it would provoke, disruption has already been taking place via targeted attacks on passing vessels, which is more than enough to deter commercial liners. Even limited interference could generate outsized economic and political effects, particularly for energy-dependent economies. All that said, the Houthis in Yemen remain on standby mode to disrupt the maritime flow via resumption of attacks on vessels passing via Bab-el Mandeb to and from the Red Sea.

Iran’s strategic depth lies not in conventional military parity but in its network of regional proxies. Groups aligned with Tehran, including those in Iraq, Syria, Lebanon, and Yemen, provide Iran with operational flexibility. Given Israel’s successful campaign in Lebanon against Hezbollah as well as the Iran-backed Iraqi militias preoccupied with the deterrence posed by the U.S. forces, the Houthis in Yemen remain the final card for Tehran. Intensified maritime threats from Houthi forces in the Red Sea are likely to reemerge at any moment. This allows Iran to impose costs on U.S. and allied interests without triggering immediate large-scale retaliation. However, the cumulative effect of a multi-chokepoint pressure strategy could compel a broader and internationally supported response.

Strategic Calculus: War vs. Controlled Escalation

Some believe that neither the U.S. nor Iran appears to seek full-scale war given that the costs (military, economic, and political) would be immense and unpredictable. For the U.S., a major conflict with Iran would disrupt global energy markets, divert resources from strategic competition with China, and risk regional destabilization affecting key allies in the Gulf Corporation Council (GCC). For Iran, a continuation of a direct war would expose critical infrastructure to sustained strikes and threaten regime survivability.

The most probable scenario over the next 2–3 weeks is a phase of controlled escalation characterized by maritime harassment incidents in the Gulf, limited proxy attacks, and intensified rhetoric and signaling. This scenario allows both sides to demonstrate resolve while avoiding irreversible steps toward war. However, it is susceptible to disruption by unforeseen incidents at any moment.

An increasingly possible scenario would be one that involves targeted military actions, such as U.S. strikes on IRGC assets or critical infrastructure vs. Iranian retaliatory indiscriminate strikes on U.S. regional allies. Such exchanges would likely be calibrated to avoid full-scale war but could easily escalate if casualties or strategic assets are impacted.

Lastly, a less likely but still possible scenario is the return to productive negotiations, driven by economic pressures including oil market volatility, as well as diplomatic intervention by third parties, including the Gulf states, China, or European actors.

The highest-impact and most consequential scenarios involve a rapid escalation into full-scale conflict, potentially triggered by Iran’s full refusal to give up on its nuclear program or ballistic missile development program. Other triggers for a full-scale conflict would include any major incident in the Strait of Hormuz, high-casualty attacks on U.S. forces, or a direct confrontation between U.S. and Iranian military assets. Such a conflict would likely expand beyond bilateral engagement, drawing in regional actors and severely disrupting global economic systems.

Key Indicators to Watch

Several indicators are going to be crucial in assessing the trajectory of the ongoing conflict. This includes maritime activity where increased Iranian harassment of shipping continues to take place. Proxy operations are also a critical indicator where the frequency and intensity of proxy attacks, and the Red Sea specifically start to rise. Finally, force posture changes remain one of the key indicators, as they are mostly based on advanced intelligence assessments, which are not available to the public or markets. That said, deployment of additional U.S. and allied assets to the region remains the clearest indicator of how the situation will move forward and provides early signs of shifts from controlled escalation to broader conflict.

For defense strategists, the imperative is clear: preparing for escalation, planning for contingencies across multiple theaters, and achieving consensus that in the current environment, the most dangerous outcomes are not those that are intended but those unintended.

Dr. Mohamed ELDoh is a business development and consulting professional in the defense and security sector. Mohamed holds a Doctorate degree from Grenoble École de Management – France, an MBA from the EU Business School- Spain, and an Advanced Certificate in Counterterrorism Studies from the University of St Andrews, UK. He regularly authors articles addressing defense cooperation, counterterrorism, geopolitics, and emerging security threats in the Middle East and Africa. The views of the author are his own.

The Escalation Trajectory of U.S.-Iran Tensions After the Collapse of the Negotiations was originally published on Global Security Review.

Strategic competition in the Indo-Pacific increasingly occurs in the grey zone, the space between routine statecraft and open armed conflict. China, North Korea, Russia, and Iran employ a range of coercive tactics designed to alter the strategic environment without triggering a conventional military response. These activities include cyber operations, maritime harassment, disinformation campaigns, economic coercion, and limited military provocations. Because these actions remain deliberately below the threshold of war, they often exploit the reluctance of states to respond with force. As grey zone competition intensifies, the question confronting policymakers is not only how to deter such activities, but also how to ensure that responses to them are credible. In this context, a nuclear alliance could serve as the ultimate strategic backstop for military responses to persistent grey zone coercion.

Grey zone strategies rely heavily on ambiguity and escalation management. The states that employ these tactics understand that their adversaries—particularly democratic states—are cautious about escalating disputes into major military confrontations. By operating just below the threshold of armed conflict, grey zone actors seek to gradually erode the strategic position of their opponents while avoiding a decisive response. Maritime coercion in disputed waters, persistent airspace incursions, cyber intrusions, and limited military demonstrations all serve this purpose. Over time, these actions can reshape the operational environment, undermine alliances, and weaken the credibility of deterrence.

The difficulty lies in crafting responses that are both proportionate and credible. Conventional military responses to grey zone activities risk escalating a crisis if they are perceived as excessive, yet insufficient responses can embolden further coercion. This dilemma has led analysts to argue that deterrence in the grey zone requires a layered approach that combines political, economic, and military tools. However, even robust conventional responses may prove insufficient if adversaries believe that escalation dominance ultimately rests in their favor. It is in this context that nuclear deterrence retains enduring strategic relevance.

A nuclear alliance would not be designed to deter grey zone activities directly. Nuclear weapons are instruments of last resort intended to deter existential threats and large-scale conventional aggression. Nevertheless, the presence of a credible nuclear backstop fundamentally shapes the broader strategic environment in which grey zone competition occurs. By reinforcing the credibility of allied military responses, nuclear deterrence can prevent grey zone crises from escalating into major wars while simultaneously discouraging adversaries from testing the limits of conventional deterrence.

In practical terms, a nuclear alliance would strengthen escalation management in the Indo-Pacific. If regional states believed that their security rested on a collective nuclear deterrent, they would be better positioned to respond firmly to grey zone provocations. Maritime patrols, cyber countermeasures, and limited military deployments could be undertaken with greater confidence that adversaries would hesitate to escalate beyond the conventional level. In this sense, nuclear deterrence functions as a strategic umbrella under which lower-level military responses can occur without triggering uncontrolled escalation.

The experience of the Cold War offers a useful historical precedent. During that period, the North Atlantic Treaty Organization relied on nuclear deterrence to prevent large-scale aggression by the Soviet Union while simultaneously engaging in conventional competition across multiple domains. Although grey zone tactics—including espionage, proxy conflicts, and political interference—were common, the presence of a credible nuclear deterrent helped ensure that such competition did not escalate into direct war between nuclear powers. A similar logic could apply in the Indo-Pacific today.

In the contemporary regional context, a nuclear alliance could involve close coordination among the United States and key Indo-Pacific partners. Such an arrangement would not necessarily require the proliferation of nuclear weapons. Instead, it could mirror existing extended deterrence frameworks in which nuclear-armed states provide security guarantees to non-nuclear allies while maintaining operational control over nuclear forces. Through mechanisms such as joint planning, strategic consultation, and integrated command structures, allied states could strengthen the credibility of collective deterrence without undermining existing non-proliferation commitments.

Importantly, a nuclear backstop would also reinforce political resolve among allied states. Grey zone strategies often aim to exploit divisions within alliances by testing whether partners will respond collectively to incremental coercion. If adversaries perceive hesitation or disunity, they may conclude that the risks of escalation are manageable. A formal nuclear alliance could signal a high level of strategic commitment among participating states, thereby increasing the perceived costs of continued grey zone pressure.

Critics may argue that linking nuclear deterrence to grey zone competition risks lowering the nuclear threshold or introducing unnecessary escalation dynamics. These concerns highlight the importance of clearly defining the role of nuclear weapons within a broader deterrence framework. The objective would not be to threaten nuclear retaliation for minor provocations, but rather to ensure that adversaries understand that attempts to escalate beyond the grey zone could encounter a unified and credible deterrent response. In this sense, nuclear deterrence functions as a stabilizing force that sets clear limits on how far coercion can be pushed.

As the Indo-Pacific becomes the central arena of strategic competition, the persistence of grey zone tactics will continue to test existing security arrangements. States that rely solely on conventional responses may find themselves locked in a cycle of incremental coercion that gradually shifts the balance of power. By contrast, a nuclear alliance would provide a strategic foundation that reinforces the credibility of allied military responses across the escalation spectrum.

Ultimately, understanding grey zone actors and the tactics they employ is essential for effective deterrence. Yet deterrence also requires credible escalation management and the assurance that adversaries cannot exploit the space between peace and war indefinitely. In the Indo-Pacific, a carefully structured nuclear alliance could provide the strategic backstop necessary to ensure that responses to grey zone coercion remain both credible and effective while preventing escalation into catastrophic conflict.

Natalie Treloar is the Australian Company Director of Alpha-India Consultancy, a Senior Fellow at the Indo-Pacific Studies Center (IPSC), a Senior Analyst at the National Institute for Deterrence Studies (NIDS), and a member of the Open Nuclear Network. Views expressed in this article are the author’s own.

Beyond a Pacific Defense Pact 3: A Nuclear Alliance as the Ultimate Backstop to Grey Zone Coercion was originally published on Global Security Review.