Security Challenges of the U.S. European Command.

Key Chapter Title List

Euro-Atlantic Security Environment
Restructuring of Russian Military Forces
Russia's Strategic Partnerships
Threats in the Surrounding Regions
Strategic Imperatives of U.S. European Command
U.S. European Command's Full-Theater Deployment Posture
U.S. European Command's Operations, Activities, and Investments
Strengthening the NATO Alliance

Document Introduction

This report is based on the testimony submitted by General Christopher G. Cavoli, Commander of U.S. European Command (USEUCOM), to the U.S. Senate Armed Services Committee on April 3, 2025. The testimony comprehensively outlines the most severe security challenges faced by the European theater since the end of the Cold War, with a core focus on the persistent threat posed by Russia and its impact on the transatlantic security architecture.

The report first systematically assesses the current strategic security environment in the Euro-Atlantic region, noting that Russia's war in Ukraine has entered its fourth year, signaling its continued willingness to use military force to achieve geopolitical objectives. Russia is actively conducting destabilization campaigns in Europe aimed at creating strategic dilemmas, employing hybrid means including cyberattacks, information warfare, and election interference. Its deepening strategic partnerships with the Chinese Communist Party, the Democratic People's Republic of Korea, and Iran further complicate the global security landscape, forming a bloc of adversaries aimed at undermining the advantages of the United States and its allies.

The core section of the report provides a detailed analysis of Russia's military force restructuring process. Despite suffering significant losses on the battlefield in Ukraine, the replenishment rate of the Russian military's size and equipment has exceeded expectations. Its defense industrial base is producing tanks, armored vehicles, artillery, and missiles at an unprecedented pace. The report pays particular attention to the modernization of Russia's nuclear arsenal and its updated policies lowering the nuclear threshold, as well as its maintained full-spectrum capabilities in air, maritime, and cyberspace domains. The Russian military is learning from battlefield experience, making rapid adaptive adjustments, and integrating new capabilities such as unmanned aerial vehicles and electronic warfare, intending to gain tactical and operational advantages for future battlefields.

To counter the aforementioned threats, the report elaborates on the three strategic imperatives of U.S. European Command: defending the homeland forward, globally projecting U.S. combat power, and deterring Russian aggression against NATO. The report details USEUCOM's force deployments, capability building, and integration with allies across all European operational domains (land, sea, air, space, cyber), including the deployment of F-35 squadrons, enhancement of maritime power, and synergy of cyber and space capabilities. Furthermore, the report highlights the operations, activities, and investments supported by European Deterrence Initiative funding, which are designed to enhance the readiness, interoperability, and credibility of deterrence for U.S. forces and NATO allies.

Finally, the report emphasizes the historic modernization transformation underway within the NATO Alliance. This includes force structure adjustments based on regional defense plans, the reorganization of command and control systems to better synchronize multi-domain operations, and the delegation of operational decision-making authority to military commanders. USEUCOM is accelerating NATO's modernization process through the ruthless prioritization of warfighting capabilities, promoting greater European ally responsibility in security affairs. The report concludes that in the face of Russia's persistent threat, sustained U.S. leadership, investment in advanced capabilities, and a sustainable transition to an ally-led European defense are crucial.