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Saudi Arabia, Turkey and Pakistan have signed a trilateral defence agreement under which an attack on any one of the three would be treated as an attack on all, Pakistan said. The pact was concluded against the backdrop of the ongoing conflict in the Middle East and heightened tensions following the US-Iran war. The arrangement marks a significant realignment among major Sunni-majority states and could alter the regional security balance facing Iran. Details of the pact's operational commitments were not immediately disclosed.