The renewed escalation in Yemen is no longer simply a Yemeni battlefield development. For Saudi Arabia, it is becoming a direct test of national security, economic resilience and the kingdom’s ability to prevent the wider regional war from spilling further across its borders.

The latest Houthi attacks have demonstrated this clearly. Missiles and drones have hit civilian and economic sites in Abha, Khamis Mushait, Jizan and Najran, injuring dozens of civilians and causing fires and temporary disruption at energy facilities. The attacks came as fighting intensified in Yemen and around the western coast, while the Houthis continued to threaten maritime traffic in the Red Sea and Bab al-Mandeb.

Saudi Arabia therefore faces two interconnected threats: Attacks on its territory and attempts to disrupt the maritime routes on which regional and international trade depends.

This creates a difficult strategic equation for Riyadh. Saudi Arabia has spent the past several years trying to move away from direct military involvement in Yemen and towards diplomacy, de-escalation and support for a political settlement. A return to an open-ended war would contradict that strategy and impose unnecessary political and economic costs.

But restraint cannot mean accepting repeated attacks on Saudi territory.

A different security environment

The security challenge today differs considerably from the first years of the Yemen war.

Saudi Arabia has strengthened its air and missile defences, improved coordination between its military and security institutions and accumulated considerable experience in countering drones and ballistic missiles. It is therefore much better prepared to defend its territory than it was a decade ago.

Yet the Houthi threat has also evolved.

The group possesses a combination of ballistic missiles, cruise missiles and increasingly sophisticated drones. Even when most incoming weapons are intercepted, relatively inexpensive systems can impose disproportionate defensive costs and create uncertainty around airports, industrial facilities, border communities and energy infrastructure.

This means Saudi security cannot depend on interception alone. No air defence system can guarantee a perfect shield indefinitely.

The strategic objective must therefore be deterrence: Convincing the Houthis that attacks on Saudi territory will impose costs greater than any political or military benefit they expect to obtain.

This does not necessarily require returning to the large-scale military campaign of previous years. Riyadh has more options today. These include intelligence operations, strengthening Yemeni government forces, improving border security, disrupting missile and drone supply networks and, where necessary, conducting proportionate operations against facilities directly involved in attacks on Saudi Arabia.

The distinction is important. Saudi Arabia does not need to choose between doing nothing and returning to a full-scale war.

The economic front

The economic consequences are equally important.

Saudi Arabia is one of the world’s largest energy exporters, which makes attacks on its oil infrastructure internationally significant even when physical damage is limited. The latest attacks affected energy facilities and contributed to renewed concern in already nervous global oil markets.

There is an apparent paradox here: Regional instability can push oil prices higher and temporarily increase Saudi oil revenues. But higher prices caused by war should not be confused with economic benefit.

Saudi Arabia’s economic strategy under Vision 2030 depends increasingly on stability, investment, tourism, logistics, technology and the development of major projects outside the oil sector. Persistent missile and drone attacks can raise insurance and transport costs and affect perceptions of regional risk even if the kingdom’s underlying economy remains strong.

The greater strategic concern is maritime security.

Saudi Arabia occupies a strategic position between two of the world’s most important energy corridors: The Strait of Hormuz to the east and Bab al-Mandeb to the west. Disruption of both routes represents a serious challenge not only for Saudi Arabia but for the global economy.

This is why the Red Sea dimension of the Yemen conflict is particularly important. Bab al-Mandeb connects the Indian Ocean with the Red Sea and the Suez Canal. A sustained Houthi ability to threaten shipping there would increase freight and insurance costs and potentially divert vessels around Africa.

Saudi Arabia, however, possesses an important strategic advantage: Its energy infrastructure is not completely dependent on the Gulf. The kingdom can transport significant quantities of oil through its East-West pipeline to terminals on the Red Sea. This provides an alternative to Hormuz and gives Riyadh greater strategic flexibility.

That advantage does not, however, eliminate Saudi Arabia’s exposure to insecurity elsewhere in the Red Sea, including around Bab al-Mandeb.

Protecting Bab al-Mandeb should therefore be understood not simply as a Saudi or Yemeni interest but as an international economic and security requirement.

Avoiding the Houthi trap

The greatest danger for Riyadh may be political rather than purely military.

The Houthis could benefit from drawing Saudi Arabia back into an extensive war. It would allow them to portray the conflict once again as a confrontation between Yemen and an external power rather than a struggle among Yemenis over the future of their state.

Saudi Arabia should avoid this trap.

Confronting the Houthis must remain fundamentally a Yemeni responsibility. The internationally recognised Yemeni government and its forces should carry the principal burden of confronting Houthi expansion on the ground, while Saudi Arabia provides political, economic, intelligence and defensive support.

This is particularly important on the western coast. If the Houthis consolidate their military position around strategic areas overlooking the Red Sea and Bab al-Mandeb, the consequences will extend far beyond Yemen.

The objective should not be to retake Sanaa through another large-scale air campaign or restart an indefinite regional war. It should be to prevent the Houthis from using military force to change the regional balance, threaten neighbouring states or threaten international maritime arteries.

Diplomacy backed by deterrence

Saudi policy is therefore likely to operate on several tracks simultaneously.

First, Riyadh will continue strengthening its air and missile defences and protecting critical infrastructure. Second, it can increase support for Yemeni government forces while avoiding unnecessary direct involvement in ground combat. Third, it will seek broader regional and international cooperation to secure the Red Sea and Bab al-Mandeb.

At the same time, diplomatic channels should remain open.

Saudi Arabia has repeatedly demonstrated its preference for a negotiated settlement in Yemen. But negotiations are sustainable only when both sides believe that escalation carries unacceptable costs.

Diplomacy, therefore, must be backed by credible military power.

Saudi Arabia has strong incentives to prevent Yemen from becoming another permanent front in the wider regional confrontation. The kingdom’s economic transformation requires stability, while its geopolitical interests require secure borders, uninterrupted energy exports and freedom of navigation.

But the same logic that encourages restraint also places limits on it.

If attacks on Saudi cities, civilians and energy infrastructure continue, Riyadh will increasingly regard the issue not as intervention in the Yemeni civil war but as the defence of Saudi territory.

That distinction will shape what comes next.

Saudi Arabia does not need another prolonged Yemen war. Nor does Yemen. But avoiding one requires restoring deterrence while preserving the possibility of a political settlement.

The most effective Saudi strategy, therefore, is neither unlimited escalation nor passive restraint. It is calibrated pressure: Defend the kingdom, strengthen legitimate Yemeni institutions, protect the Red Sea, keep diplomatic channels open and make clear that attacks on Saudi territory will carry consequences.

The views expressed in this article are the author’s own and do not necessarily reflect Al Jazeera’s editorial stance.