How exposed is Saudi Arabia? Yemen's Houthis scale up drone and missile attacks

How exposed is Saudi Arabia? Just as Iran's retaliation to Donald Trump's war suddenly exposed the vulnerability of neighbouring Gulf states, how much is Riyadh reeling from the escalation with Yemen's Tehran-backed Houthis? We assess the physical and material damage from strikes on airports and oil facilities, as well as eventual repercussions for the kingdom's ability to project strength. In the age of cheap drone warfare, how much can a battle-hardened militia push against the region's richest nation?