Editor's note: Xu Ying is a Beijing-based international affairs commentator for CGTN. The article reflects the author's opinions and not necessarily the views of CGTN.

The large-scale military strikes launched by the United States and Israel against Iran on February 28 have pushed the Middle East into one of its most dangerous moments in decades. What began as a so-called "preemptive" campaign has now escalated into a crisis of historic proportions. The death of Iran's Supreme Leader, Ayatollah Ali Khamenei, confirmed by Iran's state broadcaster IRIB on Sunday morning, marks a turning point not only for Iran but for the entire region.

The killing of a sitting head of state-level authority during an ongoing military confrontation represents an unprecedented escalation. It signals a shift from limited military deterrence to a form of conflict that risks dismantling the very framework of regional order. The consequences of such an event are impossible to fully predict, but history suggests they will be profound, prolonged and destabilizing.

Explosions across multiple Iranian cities, including Tehran and Isfahan, had already demonstrated the scale of the initial assault. Missile strikes on military installations, air defense engagements and retaliatory drone operations indicated that the confrontation was rapidly intensifying. Now the death of Iran's top leader elevates the conflict into an entirely different category – eliminating critical channels for political decision-making during wartime, increasing the likelihood of uncontrolled escalation and risking transforming a military exchange into a full-scale regional war.

China has expressed grave concern over these developments, emphasizing that national sovereignty and territorial integrity must be respected and calling for an immediate halt to military operations. Such appeals reflect not only a principled diplomatic position but also a realistic assessment of the dangers now unfolding.

The implications inside Iran are particularly severe. As the country's highest political and religious authority for more than three decades, Khamenei represented a central pillar of Iran's political system. His sudden death creates uncertainty at the highest levels of governance at precisely the moment when stability is most urgently needed. Leadership transitions are always sensitive, but a transition under conditions of active military conflict carries exceptional risks.

Such uncertainty may encourage more aggressive responses from multiple actors. Without clear and unified leadership, command structures can become strained, and the risk of miscalculation rises sharply. Military units operating under heightened alert may respond more quickly and more forcefully to perceived threats. In such an environment, even minor incidents can trigger major escalations.

The regional implications are equally alarming. Iran occupies a central strategic position in the Middle East, with influence that extends across political, economic and security spheres. Any prolonged instability within the country will inevitably affect neighboring states, energy markets and international shipping routes. The possibility of wider confrontation is no longer theoretical but increasingly plausible.

Already, retaliatory strikes and heightened military alerts across the region indicate that the conflict is expanding. Missile and drone operations targeting military facilities and strategic infrastructure demonstrate that the cycle of action and reaction is accelerating. Each new exchange narrows the space for diplomacy while increasing the human and economic costs.

Equally troubling is the precedent such an assassination sets. The targeting of a national leader undermines long-standing norms governing international relations. Respect for sovereignty has been a cornerstone of the international system for decades. When that principle is weakened, the barriers against escalation are lowered, and the use of force becomes easier to justify.

If such actions become normalized, the consequences will extend far beyond the Middle East. Other regions may witness similar escalations as states come to believe that political objectives can be achieved through targeted killings and military pressure. The erosion of these norms risks pushing the international system toward a more dangerous and unstable era.

The humanitarian dimension must not be overlooked. Civilian casualties have already been reported in multiple locations, including residential areas affected by strikes. Infrastructure damage threatens essential services, and continued escalation risks displacing large populations. The longer the conflict continues, the greater the suffering will become.

Diplomacy now faces its most difficult test. Dialogue is always challenging in times of conflict, but it becomes even more complicated when violence reaches this level of intensity. Yet the alternative – unchecked escalation – is far more dangerous. Without active diplomatic engagement, the crisis risks spiraling into a confrontation that could engulf the entire region.

The international community must recognize the gravity of this moment. Calls for restraint are no longer sufficient on their own. Concrete steps toward de-escalation are urgently needed. Communication channels must remain open, and efforts to reduce tensions must be intensified. 

The events of the past few days illustrate how quickly a conflict can escalate beyond its original scope. What may have begun as a limited operation has now evolved into a crisis with global implications. Energy markets, international trade routes and financial systems are all vulnerable to disruption. In an interconnected world, the consequences of regional conflict are felt far beyond the battlefield.

The stakes could not be higher. The Middle East stands at a crossroads between escalation and restraint. One path leads toward broader war and prolonged instability. The other leads toward dialogue and the possibility – however distant – of peaceful coexistence.

The death of Khamenei should serve as a wake-up call to the world. It is a reminder that once violence reaches a certain threshold, controlling its consequences becomes extraordinarily difficult. Escalation may begin with missiles and airstrikes, but it rarely ends there.

Missiles can destroy cities. Assassinations can remove leaders. But neither can bring lasting peace. Stability cannot be imposed through force, nor can trust be built through violence. Only sustained dialogue and mutual respect can provide a foundation for long-term security.

At a time when global tensions are already high, the descent into further confrontation would be a tragedy not only for the Middle East but for the world. Preventing that outcome must now be the urgent priority of all responsible members of the international community.

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