After nearly four years of uneasy quiet, Yemen's Houthi movement has fired missiles at Riyadh, shattering a ceasefire that many had hoped might hold long enough to become peace. The attack is less a sudden rupture than the surfacing of tensions that never truly subsided — rooted in a decade of civil war, competing regional ambitions, and the enduring rivalry between Saudi Arabia and Iran. The Houthis have signaled not just capability but doctrine: any response will be met in kind. The world watches to see whether any voice can interrupt a cycle in which restraint, on either side, has come to f