Southeast Asian leaders are intensifying efforts to uphold the Southeast Asia Nuclear Weapon-Free Zone (SEANWFZ) treaty amid growing regional uncertainties. This decades-old agreement, which prohibits the development and deployment of nuclear weapons in the region, is now being re-examined as a key diplomatic asset. The involvement of major global powers such as the United States, Russia, and China suggests that the treaty could serve as a strategic lever in broader geopolitical negotiations.