Houthi Blockade of Saudi Arabia Escalates Along a Critical Oil Route

The Houthi campaign against Saudi Arabia has moved from a declaration to a broader pattern of maritime threats, claimed tanker attacks and strikes along Yemen’s western coast. On July 20, the group announced a “maritime embargo” against Saudi Arabia and warned shipping companies not to load or unload cargo at Saudi ports. Riyadh condemned the move and threatened a firm response.

The escalation matters because it targets the route Saudi Arabia has relied on as shipping through the Strait of Hormuz has become severely constrained. But the available evidence requires a careful distinction: the blockade announcement and attacks on Mokha are supported by multiple reports, while the claimed strikes on the tankers Wafa and Daisy, the total of eight or nine vessels, and alleged plans to seize islands remain incompletely verified.

What has been claimed—and what is confirmed

Houthi officials said on August 5 that they had attacked two Saudi oil tankers. One was identified as the Wafa, allegedly struck by ballistic missiles off Yanbu in the northern Red Sea; the other, the Daisy, was reportedly targeted in the Gulf of Aden and forced to turn back. Houthi statements described these as the eighth and ninth tanker attacks since the blockade began.

Those reports establish that the Houthis made the claims—not that the tankers were definitively hit or damaged. The provided reporting does not contain reliable independent confirmation of either incident, and the conflicting count of eight or nine reflects the group’s own tally. The same caution applies to later claims of an attack on a Saudi military landing ship and four escort vessels near Mokha. Reuters reported the allegation but said there was no immediate confirmation from Saudi authorities.

The campaign has nonetheless produced a measurable commercial response. Reuters reported that recent Saudi crude loadings at Yanbu were conducted without AIS tracking signals, apparently to reduce the risk of identifying vessels at sea. That practice also makes it harder to determine how much Saudi crude is actually moving through the Red Sea.

Why Saudi Arabia’s Red Sea route became vulnerable

The crisis around Hormuz changed the geography of Saudi oil exports. Reuters reported that crude and refined-product flows through the strait averaged about 18 million barrels per day before the conflict, fell to 4.8 million barrels per day in July and averaged about 2 million barrels per day in August through the date of its report, according to Kpler.

That disruption increased the importance of Saudi Arabia’s Red Sea infrastructure, particularly the port of Yanbu. But Yanbu is not a risk-free substitute for Gulf export terminals. Oil leaving the Red Sea must still pass the Bab al-Mandab, the narrow gateway between the Red Sea and the Gulf of Aden. The Houthis’ blockade therefore threatens the very alternative route that became more valuable when Hormuz shipping was restricted.

Saudi Arabia has also sought to reduce exposure by moving more crude through a pipeline across Egypt to the Mediterranean. That option can bypass Houthi-controlled waters, but it is longer and more expensive for Asian customers, which are among Saudi Arabia’s traditional markets.

The result is not a simple “surge” in safe Saudi exports through Bab al-Mandab. Some export activity may have shifted toward the Red Sea, but dark AIS operations make precise flow estimates difficult, while the Egyptian route shows that Riyadh is already trying to avoid concentrating all shipments in one exposed corridor.

Why the Houthis are threatening the northern Red Sea

The blockade’s coercive logic is straightforward: if Saudi Arabia cannot reliably use Hormuz, threatening Yanbu, the Red Sea approaches and Bab al-Mandab can deny Riyadh its principal maritime alternative. The Houthis’ July warning told companies that vessels using Saudi ports could be targeted.

A full physical closure is not required to impose economic pressure. Threats alone can lead shipowners to delay voyages, switch off tracking systems, seek naval protection or reroute around the Cape of Good Hope. Those choices increase sailing times, fuel consumption, insurance costs and freight rates. Early reporting linked the Bab al-Mandab threat to a sharp rise in oil prices, with Brent gaining more than 13% in a matter of days and moving above $100 a barrel in the Guardian’s account.

Bab al-Mandab is also important beyond oil. It connects the Red Sea with the Gulf of Aden and supports traffic bound for the Suez Canal. Disruption there can affect container shipping, energy cargoes and commercial supplies moving between Asia, Europe and the Middle East.

Mokha and the risk of a wider coastal offensive

The attacks have not been limited to statements about shipping. The Houthis struck Mokha, a government-held port on Yemen’s Red Sea coast, with missiles and drones. Reports described civilian and military casualties, damage to port infrastructure and repeated waves of attacks.

The location is strategically significant. Mokha lies near Bab al-Mandab, so pressure there can serve two purposes at once: weakening forces aligned with Yemen’s internationally recognized government and improving the Houthis’ ability to threaten shipping near the strait.

Yemeni officials and other regional reporting have warned that the Houthis may seek to expand south along the western coast and establish positions near strategic islands and the Bab al-Mandab approaches. Such warnings should not be treated as proof that a successful seizure operation is imminent. The available material does not independently substantiate the specific claim that roughly 2,000 fighters are being deployed, nor does it establish that the Houthis can capture and hold the southern coast or the islands against local forces and outside naval power.

The more defensible conclusion is narrower: the attacks demonstrate an effort to increase pressure along the coast and make the Bab al-Mandab threat credible. Whether that becomes territorial expansion depends on the Houthis’ ability to move forces, sustain them, overcome anti-Houthi defenses and withstand a Saudi or international response.

What this means for Yemen’s civil war

A sustained coastal campaign would blur the line between Yemen’s internal war and the regional confrontation involving Iran, Saudi Arabia and the United States. Government-aligned forces, local west-coast formations and foreign supporters could be drawn into renewed fighting around ports, coastal roads and maritime surveillance sites.

The humanitarian risk is immediate. Reports of attacks on Mokha included civilian deaths and injuries, while the Security Council Report said the strikes caused extensive damage to the port. Further disruption could restrict imports and worsen the cost and availability of food, fuel and other essential goods.

A new front would also make diplomacy harder. The Houthis have framed the blockade as retaliation for what they describe as Saudi restrictions on Yemeni ports and airports—a rationale reported by the BBC and Reuters. Negotiations would therefore have to address both maritime security and the underlying dispute over access, military pressure and control of Yemen’s resources. Escalation at sea makes compromise more difficult while giving each side incentives to demand concessions before reducing attacks.

Saudi Arabia’s difficult choices

Riyadh’s options all carry significant risks:

• Protect the route: Saudi Arabia could expand naval escorts, air defense and missile-defense coverage around tankers, ports and coastal infrastructure.
• Support local forces: It could provide stronger military backing to anti-Houthi forces on Yemen’s west coast, potentially creating a ground campaign aimed at pushing the Houthis away from Bab al-Mandab.
• Coordinate internationally: Saudi Arabia could seek closer operational coordination with U.S., European and regional navies to protect commercial shipping and share maritime intelligence.
• Reroute exports: The Egyptian pipeline and Mediterranean terminals offer an alternative, but the longer route around Africa raises cost and delivery-time pressures for Asian buyers.
• Reopen diplomacy: Riyadh could pursue negotiations aimed at reducing restrictions and restoring a maritime arrangement, but concessions could be interpreted as rewarding attacks and might not end the threat.

A large military response could improve protection for shipping while provoking more missile and drone attacks against Saudi infrastructure. Conversely, relying primarily on rerouting may reduce immediate exposure but leave the Houthis with the ability to impose costs on global shipping through harassment and uncertainty.

The global energy and security consequences

The central danger is the simultaneous vulnerability of Hormuz and Bab al-Mandab. Before the conflict, the Strait of Hormuz carried about one-fifth of global daily oil and liquefied-natural-gas supplies, according to Reuters. Bab al-Mandab is a critical alternative corridor, with CNN reporting that roughly 6.2 million barrels of oil had been moving through the strait.

If both routes remain insecure, the consequences could include:

• higher oil and shipping prices;
• more cargo diversions around the Cape of Good Hope;
• lower Suez Canal traffic;
• higher war-risk insurance premiums;
• delays for energy and manufactured goods; and
• greater pressure on food and commercial imports into Yemen and nearby markets.

The most dangerous outcome is not necessarily a formal Houthi takeover of Bab al-Mandab. A prolonged ability to threaten both the Red Sea and the Gulf could be enough to reshape shipping decisions and energy prices. It would also force Saudi Arabia, the United States and other regional powers to choose between tolerating disruption, escorting vessels or striking launch and support infrastructure in Yemen.

That is why the tanker claims matter even where they remain unverified. The strategic effect of a blockade can begin before every alleged hit is independently confirmed: uncertainty itself raises the cost of moving through a chokepoint. At the same time, distinguishing verified attacks from Houthi claims is essential for judging whether the campaign is becoming a sustained maritime interdiction effort or remains primarily a coercive threat backed by selective strikes.