For much of the past year, governments and energy markets have operated on a shared assumption: maritime disruption in the Middle East could be managed through diversification. If the Strait of Hormuz became too dangerous, Saudi crude could increasingly move west through the East-West pipeline to Yanbu before reaching global markets via the Red Sea.
If one corridor came under pressure, another would absorb part of the shock. It was never a certainty, but it became the resilience model underpinning regional energy planning. Thursday’s Houthi attack on two Saudi oil tankers suggests that assumption is beginning to unravel, effectively doubling the maritime crisis across the Indo-Mediterranean.
Why it matters: By striking the Encelia and the Layla after announcing a naval blockade against Saudi Arabia earlier this week, stretching from Bab el-Mandeb into the southern Red Sea, the Yemeni movement has done more than escalate the conflict.
- It has targeted one of the key mechanisms designed to keep regional trade functioning despite persistent instability. Markets immediately recognised the significance.
- Brent crude climbed above $99 a barrel for the first time since late May, not because the attacks removed a substantial volume of oil from the market, but because traders began pricing the possibility that the Middle East’s two principal maritime energy corridors could remain under simultaneous pressure.
The implications extend well beyond oil prices. Routing vessels around the Cape of Good Hope once again becomes one of the few credible options for maintaining Europe-Asia connectivity, just as governments and shipping companies were cautiously hoping that the Red Sea might gradually stabilise after nearly two years of Houthi attacks.
- Between late 2023 and mid-2025, the movement repeatedly targeted commercial shipping as part of what it publicly described as its campaign in support of the Palestinians following Hamas’ October 7 terrorist attack against Israel. That period now risks giving way to a new and potentially more complex phase.
The timing is hardly accidental. As Iranian pressure on shipping through the Strait of Hormuz intensified, Saudi Arabia increasingly relied on Yanbu, where almost five million barrels of crude and refined products are loaded each day for Asian markets.
- The objective was straightforward: reduce dependence on Hormuz by moving exports across the Kingdom to the Red Sea. Yet that strategy still depends on safe passage through Bab el-Mandeb. It is precisely that critical link in the logistical chain that the Houthis are now seeking to place under pressure.
The Houthis’ agenda. The movement is still routinely described as little more than an Iranian proxy. Tehran’s military support has undoubtedly been central to its evolution into one of the region’s most capable non-state actors. Yet that definition alone no longer explains Houthi behaviour.
- The group has increasingly demonstrated its ability to exploit wider geopolitical crises in pursuit of its own strategic objectives, aligning with Iran where interests converge while preserving an independent political agenda centred on Yemen’s future and its own regional legitimacy. In this case, that agenda combines military pressure, strategic signalling and political leverage over Riyadh.
The attack on Saudi shipping reflects exactly that calculation. On one level, it reinforces Iranian pressure on the United States by widening the economic and geopolitical consequences of the war. On another, it delivers a message directly to Saudi Arabia: no future security architecture in the Red Sea, and no durable settlement for Yemen, can realistically bypass the Houthis. Maritime disruption has become a negotiating instrument.
That is what makes the current moment different. The Houthis are no longer threatening a single strategic chokepoint. They are challenging the resilience mechanisms designed to compensate for disruptions elsewhere. Hormuz and Bab el-Mandeb can no longer be treated as separate strategic files, even in the most commercially driven planning exercises. Increasingly, they form part of the same system of maritime coercion, in which instability in one corridor amplifies vulnerability in the other.
Washington appears increasingly willing to adopt that same perspective. Responding to the attacks, President Donald Trump warned that any future Houthi strike would trigger “major military punishment” not only against the Yemeni movement but also against Iran itself, describing the Houthis as “a surrogate and/or proxy” of Tehran.
- The statement carries broader strategic implications than the immediate threat suggests. Regardless of the Houthis’ operational autonomy, the White House is signalling that it is prepared to treat the Red Sea and the Persian Gulf as components of the same strategic theatre. The risk is that escalation in one maritime space could rapidly generate military consequences in the other.
Europe faces a different challenge. The European Union already has a naval mission deployed in the region. Operation Aspides was established in response to Houthi attacks on commercial shipping following October 7, reflecting a growing recognition in Brussels that security in the Red Sea had become a direct European strategic interest.
- From the outset, however, the operation has been presented as strictly defensive: protecting freedom of navigation rather than conducting offensive operations against the Houthis. That distinction has been politically essential in sustaining support among EU member states.
The dilemma was underscored this week by EU Special Representative for the Gulf Luigi Di Maio. Condemning the Houthi blockade as “a direct threat to regional stability” and the attack on the Saudi tanker as “unacceptable” and “illegal”, Di Maio stressed that “navigation must be unimpeded” in both the Strait of Hormuz and the Red Sea. He also reaffirmed that Operation Aspides “remains firmly committed to protecting freedom of navigation… in line with its defensive mandate.”
That final qualification may soon come under increasing pressure. Escorting merchant vessels through contested waters is one thing; guaranteeing their passage through a blockade enforced with missiles, drones and fast attack craft is another.
- By definition, a naval blockade cannot be episodic. It requires operational continuity, credible deterrence and the sustained ability to convince shipowners that the risks are constant rather than occasional.
- Should the Houthis follow through on their threat, Aspides could find its operational environment evolving much faster than the legal and political definitions underpinning its mandate. European naval forces would increasingly operate in the grey zone between protecting freedom of navigation and actively ensuring it against an armed threat.
What we’re watching: Whether the Houthis possess the military capacity to sustain such a campaign remains an open question. Previous US operations degraded part of the group’s capabilities, while Iranian military support may itself become more constrained under continued American and Israeli pressure.
- At the same time, Oman continues to mediate in an effort to prevent the complete collapse of the fragile understanding that has emerged in recent years between Riyadh and the Houthis. Yet the strategic consequences of Thursday’s attack are already becoming visible. For the first time, the issue is no longer simply the security of a maritime corridor, but the viability of the alternatives built to absorb future disruptions.
The bottom line: The effectiveness of the blockade may matter less than its ability to reshape the behaviour of everyone else. If governments, shipping companies, insurers and naval planners are forced to rethink routes, risk calculations, force posture and rules of engagement, the Houthis will already have achieved their principal strategic objective.
- Their goal may not be necessarily to close Bab el-Mandeb altogether. It is to demonstrate that the resilience architecture underpinning the Indo-Mediterranean’s critical maritime corridors can no longer be taken for granted.
