In a shifting multipolar world, Saudi Arabia and Pakistan have formalized a landmark mutual defence pact marking a new era in regional security. The agreement reflects Riyadh’s strategic pivot from dependence on the U.S. towards trusted partners like Pakistan, an established military power in the Islamic world. Beyond reaffirming deep-rooted bilateral ties, the pact reshapes South Asia–Gulf dynamics, deters Indian aggression, and signals a broader trend of regional cooperation amid evolving geopolitical threats.