This article examines the evolution of a strategic partnership between Azerbaijan and the Central Asian states, focusing on the transformation of their relations from a shared historical and cultural foundation to the pursuit of new regional interests. The study highlights the role of common Turkic identity, linguistic ties, geography, and cultural heritage as a soft power base that now complements pragmatic cooperation in economics, energy, transport, and security. Special attention is given to activities within the Organization of Turkic States (OTS) and the growing significance of trans-Caspian connectivity projects that strengthen regional integration, enhance Eurasian integration, and reduce dependency on traditional power centres. The analysis shows that Azerbaijan’s proactive diplomacy and Central Asia’s multi-vector foreign policy complement one another, creating dual engines of Turkic connectivity across the Caspian. Key questions of Azerbaijan–Kazakhstan relations are analysed separately to highlight their specific dynamics within the broader regional context. The analysis concludes that this emerging alliance represents not merely cultural solidarity but a strategic axis of Eurasian stability and autonomy.