As a geopolitical and strategic region, the Caspian Sea has, in recent years, experienced shifts in the balance of power driven—contrary to the provisions of the 2018 Convention—by the quiet and gradual influence of actors such as Turkey and Israel on the military and security structures of Azerbaijan and Turkmenistan. This article, using a descriptive-analytical method and relying on open-source materials, examines the security and geopolitical dimensions of this trend. It highlights how the Caspian Sea, despite the formal prohibition of foreign military presence, has become a theater for covert NATO and Israeli competition along Iran’s northern borders. In response to this situation, the study proposes a strategic framework for Iran based on the innovative 4C Strategy (Customer, Cost, Convenience, Communication), which emphasizes intelligent engagement with neighboring countries rather than direct confrontation. Within this model, Azerbaijan and Turkmenistan are viewed not as threats but as potential partners.The article argues that Iran should rebuild its geopolitical ties with these states through energy diplomacy, the reconstruction of defense infrastructure, leveraging cultural and religious commonalities, and establishing cooperative security institutions. The study concludes that to preserve and enhance its role in the evolving security order of the Caspian Sea, Iran must go beyond a purely military balancing approach and adopt a participatory, multi-layered strategy focused on trust-building and regional cooperation.