KMAN Publication Incorporation Interdisciplinary Studies in Society, Law, and Politics 3060-5687 In Press 2027 05 01 The Role of the United States, Russia, China, and the European Union in Regional Policies and Their Impact on Stability and Security The Role of the United States, Russia, China, and the European Union in Regional Policies and Their Impact on Stability and Security 1 11 EN Journal Article 2026 03 17 <p>The geopolitical transformations of the past two decades, particularly following the relative decline of United States hegemony, have intensified competition among four major actors—the United States, Russia, China, and the European Union—for influence in strategic regions such as Central Asia and the Middle East. This competition has significantly affected patterns of regional stability and security and can be analyzed through the lenses of balance of power, soft balancing, and multi-level agency. The objective of this study is to explain the roles and strategies of these powers in regional policies and to analyze their implications for stability and security. The research employs a qualitative approach and a documentary analysis method, based on a systematic review of selected scholarly and research sources. The findings indicate that the United States relies on security alliances and military presence; Russia utilizes geopolitical and energy-centered instruments; China advances its influence through the Belt and Road Initiative and soft-balancing strategies; and the European Union pursues a policy of “smart containment” and conditional cooperation. Each actor seeks to consolidate or expand its sphere of influence. While the interactions and rivalries among these four actors create certain opportunities for multilateral cooperation, they more frequently intensify competition, generate short-term instability, and complicate regional security dynamics. The study concludes that sustainable regional stability and security require the effective management of great-power conflicts of interest through multilateral mechanisms and the strengthening of the role of indigenous regional actors.</p> https://journalisslp.com/index.php/isslp/article/download/509/1019