A series of military deployments, pacts and defence agreements involving Saudi Arabia highlights the kingdom’s focus on deepening co-operation with regional partners while reshaping its own security priorities and, in turn, those of key allies. As the Houthi missile and drone threat grows, Saudi Arabia, with energy sites and airports spread across vast territory, has become increasingly exposed to the spillover from the wider US-Iran conflict, which could once again escalate into full-scale war.