On Saturday, Houthi missiles struck Riyadh's international airport, killing 13 and wounding hundreds. A follow-up attack Sunday killed one more and injured nearly a dozen. CCTV footage showed travelers cowering at impact. These were the deadliest strikes on Saudi territory in a decade and the most significant disruption to Saudi civil aviation in years. The timing is not random. After sitting out the initial US-Israel campaign against Iran, the Houthis seized virtual control of the Bab al-Mandab strait — the chokepoint governing Red Sea shipping for oil and gas exports. When Yemeni government forces and Saudi-backed allies launched a counteroffensive last week, the Houthis answered by hitting the kingdom's most visible civilian infrastructure. Saudi Arabia is the world's eighth-largest military spender, yet the physics of asymmetric defense work against it. Thomas Juneau of Ottawa University notes the kingdom is simply too large to consistently defend against dispersed missile and drone attacks. Even Israel's vaunted systems nearly failed to stop a ballistic missile aimed at Ben Gurion airport last year. The US bombardment of Houthi positions in 2025 demonstrated how resilient the militia's capabilities have become, enhanced by years of Iranian technical investment. The strategic logic is clear: every strike on Riyadh's airport or oil infrastructure makes the cost of Saudi Arabia's Yemen intervention viscerally obvious. Airlines across Europe and Asia suspended services. Riyadh businesses shifted to remote work. Schools went online. Energy executives were pulled from a major conference. Iran benefits directly — its "axis of resistance" proxy demonstrates that Tehran can threaten global oil and gas flows from multiple vectors simultaneously. The global spillover is the buried lede. Houthi control of the Bab al-Mandab strait and continued strikes on Saudi oil infrastructure create compounding pressure on energy supply chains. This is not a regional skirmish — it is a leverage mechanism over international fuel prices and, by extension, inflation worldwide. Neither side shows any intention of standing down. The Houthis have explicitly promised escalation: "Unless the Saudi enemy stops its aggression and interference in Yemen, worse is yet to come." Saudi Arabia is unlikely to halt counterstrikes but equally unlikely to seal its airspace. No end to US-Iran hostilities is imminent. Farea al-Muslimi of Chatham House warns the Houthis have been consistently underestimated, noting they believe they can reposition themselves within the region — though their confidence in controlling escalation "may well be an illusion." What remains is a grinding asymmetry: the Houthis can impose costs far exceeding what it costs them to attack, while Saudi Arabia and its backers face the expensive and possibly futile task of defending everything, everywhere, always.