regional strategy and the eventual acceptance of Iran's regional role are the main factors indispensable to any formulation of a sustainable political-security arrangement in the Persian Gulf. In this context, putting aside for the moment security threats against Iran, the redefining of Iran's regional role in U.S. As a result, a new balance should be established between these two main actors. Iran and the United States are currently the only two regional and transregional actors that are able to conduct military operations in the Persian Gulf, as well as build political-security coalitions in the region at large. Such a setting generates peace and stability, cooperation, security and constructive rivalry. Balance of security is based on a non-zero-sum (win–win) game and the rise of the "relative security" of rival actors. With the new political-security developments in post-invasion Iraq, the establishment of a system based on a "balance of security" among major regional and transregional actors is a more appropriate approach to the maintenance of stability and security in the region. Such a system generates tension, distrust, crises and wars. The balance-of-power setting is based on a zero-sum (win-lose) game, as well as the rise of the "relative power" of rival actors. "Political-security arrangements in the Persian Gulf based on "balance of power" are incapable of maintaining security and stability in the region, especially since the downfall of the Baathist regime in Iraq.